A025360 - OEIS

A025360

Numbers that are the sum of 4 nonzero squares in exactly 4 ways.

52, 58, 63, 70, 76, 84, 87, 91, 93, 97, 98, 105, 119, 123, 139, 140, 141, 142, 146, 155, 158, 185, 197, 206, 208, 221, 232, 233, 269, 280, 281, 304, 336, 392, 560, 568, 584, 632, 824, 832, 928, 1120, 1216, 1344, 1568, 2240, 2272, 2336, 2528, 3296, 3328, 3712, 4480

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OFFSET

1,1

REFERENCES

Elena Deza and Michel Marie Deza, Figurate numbers, World Scientific Publishing (2012), page 305.

LINKS

Robert Price, Table of n, a(n) for n = 1..77

Eric Weisstein's World of Mathematics, Square Number.

Index entries for sequences related to sums of squares

FORMULA

{n: A025428(n) = 4}. - R. J. Mathar, Jun 15 2018

CROSSREFS