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A047694 x such that y^2=C(x,0)+C(x,1)+C(x,2)+C(x,3) is soluble. +0
2
-1, 0, 2, 7, 15, 74, 767 (list; graph; listen)
OFFSET

0,3
REFERENCES

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

CROSSREFS

Cf. A047695.

Sequence in context: A096690 A050612 A120110 this_sequence A129666 A135781 A041573

Adjacent sequences: A047691 A047692 A047693 this_sequence A047695 A047696 A047697

KEYWORD

sign,fini,full,nice

AUTHOR

njas

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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