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A106918 Primes of the form 3x^2+xy+5y^2, with x and y nonnegative. 2
3, 5, 19, 53, 167, 181, 193, 257, 263, 271, 281, 293, 307, 331, 359, 379, 449, 487, 523, 557, 607, 617, 619, 761, 829, 883, 911, 947, 997, 1031, 1049, 1187, 1231, 1303, 1433, 1487, 1523, 1549, 1553, 1667, 1669, 1759, 1811, 1889, 1933, 1973, 1993 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Discriminant=-59.
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[3, 1, 5, 10000] (* see A106856 *)
CROSSREFS
Sequence in context: A360086 A127998 A174132 * A182357 A181519 A265778
KEYWORD
nonn,easy
AUTHOR
T. D. Noe, May 09 2005
STATUS
approved

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Last modified March 28 21:57 EDT 2024. Contains 371254 sequences. (Running on oeis4.)