A002340 Numbers x such that p = x^2 - 5y^2, where p == 0, 1, or 4 (mod 5). (Formerly M3739 N1528)

5, 4, 8, 7, 6, 11, 8, 9, 14, 18, 13, 11, 17, 16, 12, 13, 14, 28, 19, 14, 18, 16, 27, 22, 31, 16, 17, 26, 19, 34, 24, 23, 22, 28, 37, 41, 27, 32, 21, 26, 22, 23, 31, 22, 44, 48, 23, 29, 39, 43, 24, 38, 51, 32, 26, 31, 28, 29, 36, 41, 27, 58, 28

Offset

1,1

References

A. J. C. Cunningham, Quadratic Partitions. Hodgson, London, 1904, p. 1.

D. H. Lehmer, Guide to Tables in the Theory of Numbers. Bulletin No. 105, National Research Council, Washington, DC, 1941, p. 55.

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=1..63.

A. J. C. Cunningham, Quadratic Partitions, Hodgson, London, 1904. [Annotated scans of selected pages]

Crossrefs

Cf. A002341.

Sequence in context: A065015 A334401 A295162 * A335846 A023845 A051555

Adjacent sequences: A002337 A002338 A002339 * A002341 A002342 A002343

Keyword

nonn

Author

N. J. A. Sloane

Extensions

Corrected and extended by Sean A. Irvine, Oct 21 2013

Offset corrected by Mohammed Yaseen, Jul 24 2023

Status

approved