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A132229 The set N such that each positive integer can be written in the form s^2 + n, s>=0, n in N, in an odd number of ways. +0
4
2, 5, 6, 8, 13, 14, 15, 16, 18, 19, 20, 21, 22, 27, 28, 31, 35, 36, 39, 40, 45, 46, 49, 53, 54, 59, 60, 63, 64, 65, 66, 67, 68, 69, 70, 72, 79, 80, 83, 84, 85, 86, 89, 90, 97, 101, 102, 107, 108, 113, 114, 117, 118, 119, 120, 127, 137, 138, 149, 150, 153 (list; graph; listen)
OFFSET

1,1

REFERENCES

Computed by Sam Taylor.

LINKS

J. N. Cooper, D. Eichhorn and K. O'Bryant, Reciprocals of binary power series

FORMULA

The terms are the exponents in the expansion of 1/((1-x)S) read mod 2 where S = Sum_{s >= 0} x^{s^2}.

CROSSREFS

Cf. A108345.

Sequence in context: A105107 A002253 A032716 this_sequence A028750 A028787 A028796

Adjacent sequences: A132226 A132227 A132228 this_sequence A132230 A132231 A132232

KEYWORD

nonn

AUTHOR

Nadia Heninger (nadiah(AT)CS.Princeton.EDU), Dec 13 2007

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Last modified December 3 01:16 EST 2008. Contains 151161 sequences.


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