Binaminal Theorem Coejicients.-Tables of the values of x(x-1), s'(x-1)(x-2)' x(x-1) . (x-5)

1.2 1.2.3 I.2...6

from x='OI to x=1 at intervals of -01 to 7 places (which are useful in interpolation by second and higher orders of differences), occur in Schulze (1778), Barlow (1814), Vega (1797 and succeeding editions), Hantschl (1827), and Kohler (1848). W. Rouse, Doctrine of Chances (London, n.d.), gives on a folding sheet (a-I-b)" for n=1, 2, . . .20. H. Gyldén (Recueil des Tables, Stockholm, 1880) gives binomial coefficients to n=40 and their logarithms to 7 places. Lambert, Supplementa (1798), has the coefficients of the first 16 terms in (1 +x)$ and (1 -x)é, their values being given accurately as decimals. 5 L 1.3 L

Vega (1797) has a page of tables giving 24, -2 4 6, . .2 3, . . and similar quantities to IO places, with their logarithms to 7 places, and a page of this kind occurs in other collections. Kohler (1848) gives the values of 40 such quantities.

Figurate Numbers.-Denoting n(n+1). . (n+i-I)/i! by [n]¢, Lambert, Supplernenta, 1798, gives [n].; from n= I to n=30 and from i=1 to i=I2; and G. W. Hill (Amer. Jour. Math., 1884, 6, p. 130) gives log10[n]¢ for n=é, § , 3, QL, 2, and from i= 1 to i=30. Trigonornetrical Quadratic Surds.-The surd values of the sines of every third degree of the quadrant are given in some tables of logarithms; e.g., in Hutt0n's (p.' xxxix., ed. 1855), we find sin 3 =%{/ (5+/5)+/1Qi+/S- /(I5+3/5) -V3-V ii? and the numerical values of the surds /(5-i'/5), 1/(125), &c., are given to 10 places. These values were extended to 20 places by Peter Gray, Mess. of Math., 1877, 6, p. 105.

Circulating Decimals.-Goodwyn's tables have been described already. Several others have been published giving the numbers of digits in the periods of the reciprocals of primes: Burckhardt, Tables des diviseurs du premier million (Paris, 1814-1817), gave one for all primes up to 2543 and for 22 primes exceedin that limit. E. Desmarest, Théarie des nombres (Paris, 1852), included all primes up to 10,000. C. G. Reuschle, Mathematische Abhandlung, e nth alt end neue zahlentheoretische Tabellen (1856), contains a similar table to 15,000. This W. Shanks extended to 60,000; the portion from 1 to 30,000 is printed in the Proc. Roy. Soc., 22, p. 200, and the remainder is preserved in the archives of the society (Id., 23, p. 260 and 24, p. 392). The number of digits in the decimal period of 1, /p, is the same as the exponent to which IO belongs for modulus p, so that, whenever the period has p-1 digits, 10 is a primitive r00t of Tables of primes having a given number, n, of digits in their perio s, i.e. tables of the resolutions of IO"-I into factors and, as far as known, into prime factors, have been given by W. Looff (in Grunerfs Archiv, 16, p. 54; reprinted in Nouv. annales, 14, p. 115) and by Shanks (Proc. Roy. Soc., 22, p. 381). The former extends to n=6o and the latter to n=100, but there are gaps in both. Reuschle's tract also contains resolutions of I0"- 1.

There is a similar table by C. E. Bickmore in Mess. of Math., 1896, 25, p. 43. A full account of all tables connecting nand p where I0"= 1, mod p, 10" being the least power for which this congruence holds good, is given by Allan Cunningham (Id., 1904, 33, p. 145). The paper by the same author, “ Period-lengths of Circu1ates" gi. 1900, 29, p. 145) relates to circulatory in the scale of radix a. also tables of the resolutions of a"-1 into factors under Tables relating to the Theory of Numbers (below). Some further references on circulating decimals are given in Proc. Camb. Phil. Soc., 1878, 3, p. 185.

Pythagorean Triangles.-Right-angled triangles in which the sides and hypotenuse are all rational integers are frequently termed Pythagorean triangles, as, for example, the triangles 3, 4, 5, and 5, 12, 13. Schulze, Sammlung (1778), contains a table of such triangles subject to the condition tan § <»721;(c> being one of the acute angles). About 100 triangles are given, but some occur twice. Large tables of right-angled rational triangles were given by C. A. Bretschneider, in Grunerfs Archiv, 1841, 1, p. 96, and by Sang, Trans. Roy. Soc. Edin., 1864, 33, p. 727. In these tables the triangles are arranged according to hypotenuses and extend to 1201, 1200, 49, and 1105, 1073, 264 respectively. W. A. Whitworth, in a paper read before the Lit. and Phil. Society of Liverpool in 1875, carried his list as far as 2465, 2337, 784. See also H. Rath, “Die rational en Dreiecke, " in Grunert's Archiv, 1874, 56, p. 188. Sang's paper also contains a table of triangles having an angle of 120° and their sides integers.

Powers of rr.-G. Paucker, in Grunerfs Archiv, p. 10, gives 1r“ and -rr! to 140 places, and 7|' 2,7l' &, 'l|'§ , rri to about 50 places; ]. Burgess (Trans. Roy. Soc. Edin., 1898, 39, II., No. 9, p. 23) gives (ir)-é, 2%-rr-l, and some other constants involving-rr as well as their Briggian logarithms to 23 places, and in Maynard's list of constants (see Constants, above) -:rg is given to 31 places. The first twelve powers of rr and 1r'1 to 22 or more places were given by Glaisher, in Proc. Lond. Math. Soc., 8, p. 140, and the first hundred multiples of rr and 1-'I to 12 places by P. Kulik, Tafel der Quadrat- und Kubik-Zahlen (Leipzig, 1848).

The Series 1'"-I-2"'+3'”+&c.-Let S... s, ., an denote respectively the sums of the series 11-|-2'“+3"'+ &c., I""-2"'+3-"-'&C., 1“"+3'"+5'"+ &c. Legendre (Traité des functions elliptiques, vol. 2, p. 432) computed S., to 16 places from n=1 to 35, and Glaisher (Proc. Lond. Math. Soc., 4, p. 48) deduced sn and on for the same arguments and to the same number of places. The latter also gave Sn, sn, on for n=2, 4, 6, . . .12 to 22 or more places (Proc. Lond. Math. Soc., 8, p. 140), and the values of 2, ., where E, ,=2'"+3'"-|-5"'-I-&c. (prime numbers only involved), for n=2, 4, 6, 36 to I5 places (Compte rendu de l'/lssoc. Française, 1878, p. 172). C. W. Merrifield (Proc. Roy. Soc., 1881, 33, p. 4) gave the values of log, Sn and E., for n=1,2,3, . ., 35 to 15 places, and Glaisher (Quar. Jour. Ma, th., 1891, 25, p. 347) gave the values of the same quantities for n=2,4,6, . . ., 80 to 24 places (last figure uncertain). Merrifield's table was reprinted by j. P. Gram on p. 269 of the paper of 1884, referred to under Sine-integral, E-rc., who also added the values of logio S.. for the same arguments to 15 places. An error in E3 in Merrifield's table is pointed out in Quar. Jour. Math., 25, p. 373. This quantity is correctly given in Gram's reprint. T. ]. Stieljes has greatly extended Legendre's table of S... His table (Acta math., 1887, IO, p. 299) gives S" for all values of n up to n=70 to 32 places. Except for six errors of a unit in the last ngure he found Legendre's table to be correct. Legendre's table was reprinted in De Morganfs Diff. and Int. Calc. (1842), p. 554. Various small tables of other series, involving inverse powers of prime numbers, such as 3'"-5""+7'"+11"- 13"-|-. ., are given in vols. 25 and 26 of the Quar. Jour. Math.

Tables of ez and e", or Hyperboiic Antilogarithms.-The largest tables are the following: C. Gudermann, Theorie der potential- oder cyklisch-hyperbolischen Functionen (Berlin, 1833), which consists of papers reprinted from vols. 8 and 9 of Crelle's Journal, and gives logw sinh x, login cosh x, and logw tanh x from x=2 to 5 at intervals of -001 to 9 places and from x = 5 to 12 at intervals of 'OI to 10 places. Since sinh x=é(e”-e'=') and cosh x=é(e'+e ), the values of ef and e" are deducible at once by addition and subtraction. F. W. Newman, in Camb. Phil. Trans., 13, p. 145, gives values of e"" from x=0 to 15-349 at intervals of -001 to 12 places, from x = 15-350 to 17-298 at intervals of -002, and from x= 17-300 to 27-635 at intervals of ~005, to 14 places. Glaisher, in Carnb. Phil. Trans., 13, p. 243, gives four tables of ez, e“', log10e', log", e", their ranges being from x=-001 to -1 at intervals of -001, from -OI to 2 at intervals of -01, from -1 to 10 at intervals of -1, from 1 to 500 at intervals of unity. Vega, Tabulae (1797 and later ed.), has logm e' to 7 places and ez to 7 figures from x=~01 to IO at intervals of~-01. K6hler's Handbuch contains a small table of e”. In Schulze's Sammlung (1778) e= is given for x=1, 2, 3, . . 24 to 28 or 29 figures and for x=25, 30, and 60 to 32 or 33 figures; this table is reprinted in Glaisher's paper (loc. cit.). In Sal0m0n's Tafeln (1827) the values of e", e"°, e'“", e'°°", ... e'°°°°°“", where n has the values 1, 2, ...9, are given to 12 places. Bretschneider, in Grunert's Archiv, 3, p. 33, gave ez and e" and also sin x and cos x for x=I, 2, . . .IO to 20 places, and J. P. Gram (in his paper of 1884, referred to under Sineintegral, &1'c.), gives e“' for x=IO, 11, . .20 to 24 places, and from x=7 to x=20 at intervals of 0-2 to 10, 13, 14, or 15 places. j. Burgess (Trans. Roy. Soc. Edin., 1888, 39, II. No. 9) has given (p. 26) 2

the values of e'= and /Tre" for x=% and for x=1, 2, . ., IO to 30 places. In the same paper he also gives the values of N/if" from x =0 to x = 1 -250 to 9 places, and from x = 1 -25 to x = I -50 at intervals of 'OI, and thence at various intervals to x =6 to 15 places, and the values of logw 4/§ e“”” from x=1 to x=3 at intervals of 'OOI to 16 places.

Factorials.-The values of logm (n!), where n! denotes 1 . 2 3. n, from n= I to 1200 to 18 places, are given by C. F. Degen, Tabularum Enneas (Copenhagen, 1824), and reprinted, to 6 places, at the end of De Morgan's article “ Probabilities ” in the Encyclopaedia Metropolitana. Shortrede, Tables (1849, vol. i.), gives log (nl) to n= 1000 to 5 places, and for the arguments ending in 0 to 8 places. Degen also gives the complements of the l 0garithms. The first 20 figures of the values of n><n! and the values of -log (n><n!) to IO places are given by Glaisher as far as n =71 in the Phil. Trans. for 1870 (p. 370), and the values of 1/nl to 28 significant figures as far as n=50 in Camb. Phil. Trans., 13, p. 246. Bernoullian Numbers.-The first fifteen Bernoullian numbers were given by Euler, Inst. Calc. Diff., part ii. ch. v. Sixteen more were calculated by Rothe, and the first thirty-one were published by M. Ohm in Crelle's Journal, 20, p. 11. J. C. Adams calculated the next thirty-one, and a table of the first sixty-two was published by him in the Brit. Ass. Report for 1877 and in Crelle's Journal, 85, p. 269. In the Brit. Ass. Report the numbers are given not only as vulgar fractions, but also expressed in integers and circulating decimals. The first nine figures of the values of the first 250 Bernoullian numbers, and their Briggian logarithms to IO places, have been published by Glaisher, Carnb. Phil. Trans., 12, p. 384. Tables of log tan (}1r+§ ¢).-C. Gudermann, Theorie der potenzialoder cyklisch-hyperbolischen Functionen (Berlin, 1833), gives (in 100 pages) log tan (ivr+%¢) for every centesimal minute of the uadrant to 7 places. Another table contains the values of this (function.