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390                          HlSTOEY OF THE THEORY OP NUMBERS.               [CHAP. XVI
A. Cunningham78 discussed quasi-Mersenne numbers Nq=xq--yq, with $ y sal, g a prime, tabulating every prime factor <1000 for #<50, cc<20 if <j>5, x < 50 if q=5j and treated Aurifeuillians
H. C. Pocklington79 proved that, if n is prime, (xnyn)/(xy) is divisible only by numbers of the form ran+1 unless x y is divisible by n [Euler], and then is divisible only by n and numbers of the forms mn+1, n(mn+l).
G. Fontene*80 stated that, if p is a prune and x, y are relatively prune, each prime factor of (xpyp)/(xy) is of the form kp+1, except for a factor pj occurring if x^y (mod p) and then only to the first power if p>2.
G. Fontene*81 considered the homogeneous form/(a;, y) derived from (1) by setting a=x/y. If p* is the highest power of a prime p dividing n,
/.- (//.)*'>,       *n-r= W-fT (mod p).
The main theorem proved is the following: If x, y are relatively prune every prune divisor of fn(x, y) is of the form kn+1, unless it is divisible by the greatest prime factor (say p) of n. It has this factor p if p  1 is divisible by n/p* and if x, y satisfy /n/pa=0 (modp), the latter having for each y prime to p a number of roots x equal to the degree of the congruence. In particular, if n is a power of a prime p} every prime factor of fn is of the form kn+l9 with the exception of a divisor p occurring if x=y (mod p), and then to the first power if 71^2.
J. G. van der Corput82 considered the properties of the factors of the expression derived from a?+V as (1) is derived from a' 1.
A. Ge'rardin83 factored os+68 in four numerical cases and gave (a2+3/32)4+ (4a/3)4 =n { (3a2=*= 2a/3+3/32)2 -
A. Cunningham84 tabulated factors of 2/4=b 2,
B.  D. Carmichael85 treated at length the numerical factors of an=*=/3n and the homogeneous form Qn(a, /3) of (1), when a-f/ft and aft are relatively prime integers, while a, ft may be irrational.
A. Ge"rardin85a factored z4+l for 3 = 373, 404, 447, 508, 804, 929; investigated z4-2 for a^50, ^-8 for j/^75, 8^-1 for v^25, 2w?4-l for w^37, and gave ten methods of factoring numbers Xa4  1.
L. Valroff865 factored 2z4-l for 101 ^z^ 180, 8z4-l for z<128.
A. G6rardin85c expressed 622833161 (a factor of 2010+1) as a sum of two squares in two ways to get its prime factors 2801 and 222361.
"Messenger Math., 41, 1911-12, 119-145.
"Proc. Gambr. Phil. Soc., 16, 1911, 8.
80Nouv. Ann. Math., (4), 9, 1909, 384; proof, (4), 10, 1910, 475; 13, 1913, 383-4.
IWd., (4), 12, 1912, 241-260.
MNieuw Archie! voor Wiskunde, (2), 10, 1913, 357-361.
"Wiskundig Tijdschrift, 10, 1913, 59.
"Messenger Math., 43, 1913-4, 34-57.
"Annals of Math., (2), 15, 1913-4, 30-70.
aSphinx-Oedipe, 1912, 188-9; 1913, 34-44; 1914, 20, 23-8, 34-7, 48.
Kblbid., 1914, 5-6, 18-9, 28-30, 33, 37, 73.
Htlbid., 39.   Stated by E. Fauquembergue, 1'interme'diaire des math., 21, 1914, 45.