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A047695 y such that y^2=C(x,0)+C(x,1)+C(x,2)+C(x,3) is soluble. +0
2
0, 1, 2, 8, 24, 260, 8672 (list; graph; listen)
OFFSET

0,3

REFERENCES

R. K. Guy, Unsolved Problems in Number Theory, Section D3.

CROSSREFS

Cf. A047694.

Sequence in context: A088994 A141598 A071599 this_sequence A093842 A050971 A118855

Adjacent sequences: A047692 A047693 A047694 this_sequence A047696 A047697 A047698

KEYWORD

nonn,fini,full,nice

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


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