A106928 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A106928

Primes of the form 2x^2-xy+8y^2, with x and y nonnegative.

2, 23, 53, 71, 107, 149, 197, 239, 263, 281, 317, 389, 443, 491, 557, 569, 599, 641, 653, 683, 827, 953, 977, 1031, 1061, 1163, 1289, 1439, 1451, 1481, 1499, 1523, 1607, 1619, 1667, 1709, 1787, 1871, 1877, 1901, 2069, 2111, 2129, 2153, 2213

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Discriminant=-63.

LINKS

Vincenzo Librandi and Ray Chandler, Table of n, a(n) for n = 1..10000 [First 1000 terms from Vincenzo Librandi]

N. J. A. Sloane et al., Binary Quadratic Forms and OEIS (Index to related sequences, programs, references)

MATHEMATICA

QuadPrimes2[2, -1, 8, 10000] (* see A106856 *)

CROSSREFS

Sequence in context: A057621 A074809 A084237 * A070934 A296272 A031915

Adjacent sequences: A106925 A106926 A106927 * A106929 A106930 A106931

KEYWORD

nonn,easy

AUTHOR

T. D. Noe, May 09 2005

STATUS

approved