A025380 Numbers that are the sum of 4 distinct nonzero squares in exactly 5 ways.
126, 150, 170, 186, 219, 225, 230, 242, 249, 250, 261, 267, 274, 275, 278, 287, 295, 297, 305, 311, 314, 319, 321, 322, 323, 325, 343, 346, 347, 361, 377, 379, 383, 401, 419, 421, 427, 437, 457, 463, 467, 468, 493, 500, 504, 509, 517, 523, 524, 577, 600, 680, 724, 744
Offset: 1
Keywords
Links
Programs
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Maple
N:= 100000: # for terms <= N G:= mul(1+x^(i^2)*y, i=1..floor(sqrt(N))): G4:= series(coeff(G,y,4),x,N+1): select(t -> coeff(G4,x,t) = 5, [$1..N]): # Robert Israel, Nov 19 2023
Formula
{n: A025443(n) = 5}. - R. J. Mathar, Jun 15 2018