A002347 Consider all primes of form p = (x^2 + 11y^2 )/4; sequence gives values of y. (Formerly M0151 N0061)

1, 1, 2, 1, 3, 3, 2, 4, 1, 3, 5, 5, 3, 6, 1, 7, 3, 6, 5, 3, 7, 6, 9, 9, 5, 8, 4, 10, 9, 7, 3, 11, 3, 9, 1, 11, 12, 8, 10, 12, 9, 11, 5, 9, 13, 3, 6, 1, 13, 3, 2, 10, 8, 15, 15, 7, 9, 13, 1, 15, 14, 15, 15, 5, 3, 15, 12, 4, 17, 9, 15, 11, 15, 14, 5, 6, 18, 2, 16, 7, 13, 17, 11, 18

Offset

1,3

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..84.

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

Crossrefs

Cf. A002346, A056874.

Sequence in context: A123143 A128133 A032434 * A006642 A376239 A332435

Adjacent sequences: A002344 A002345 A002346 * A002348 A002349 A002350

Keyword

nonn

Author

N. J. A. Sloane

Extensions

Offset corrected by Mohammed Yaseen, Jul 24 2023

Status

approved