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

1,1

Links

Robert Israel, Table of n, a(n) for n = 1..114

Index entries for sequences related to sums of squares

Formula

{n: A025443(n) = 5}. - R. J. Mathar, Jun 15 2018

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

Crossrefs

Cf. A025389, A025361.

Sequence in context: A165019 A025388 A025389 * A020342 A179482 A009944

Adjacent sequences: A025377 A025378 A025379 * A025381 A025382 A025383

Keyword

nonn

Author

David W. Wilson

Status

approved