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A106928 Primes of the form 2x^2-xy+8y^2, with x and y nonnegative. 1
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
KEYWORD
nonn,easy
AUTHOR
T. D. Noe, May 09 2005
STATUS
approved

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)