A002292 Related to representation as sums of squares. (Formerly M5085 N2201)

1, 20, 74, 24, 157, 124, 478, 1480, 1198, 3044, 480, 184, 2351, 1720, 3282, 5728, 2480, 1776, 10326, 9560, 8886, 9188, 11618, 23664, 16231, 23960, 11686, 9176, 60880, 16876, 18482, 3768, 35372, 15532, 3680, 31960, 4886, 47020, 2976, 44560

Offset

0,2

Comments

This is A225923 without the minus signs. - Michael Somos, Aug 09 2018

References

J. W. L. Glaisher, On the representation of a number as sum of 2,4,6,8... squares, Quart. J. Math. 38 (1907), 1-62 (see p. 56).

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Links

Table of n, a(n) for n=0..39.

Masao Koike, Modular forms on non-compact arithmetic triangle groups, Unpublished manuscript [Extensively annotated with OEIS A-numbers by N. J. A. Sloane, Feb 14 2021. I wrote 2005 on the first page but the internal evidence suggests 1997.]

Formula

a(n) = abs(A225923(n)). - Michael Somos, Aug 09 2018

Crossrefs

Cf. A225923.

Sequence in context: A263969 A139241 A139232 * A225923 A238026 A010008

Adjacent sequences: A002289 A002290 A002291 * A002293 A002294 A002295

Keyword

nonn

Author

N. J. A. Sloane

Status

approved