A106893 - OEIS

A106893

Primes of the form 3x^2-2xy+4y^2, with x and y nonnegative.

3, 5, 31, 59, 67, 71, 97, 137, 181, 223, 229, 251, 313, 353, 367, 383, 443, 449, 463, 467, 521, 619, 631, 641, 647, 653, 661, 691, 719, 727, 797, 829, 839, 947, 977, 1013, 1039, 1049, 1061, 1093, 1103, 1213, 1303, 1321, 1409, 1453, 1483, 1499, 1511

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

OFFSET

1,1

COMMENTS

Discriminant=-44.

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, -2, 4, 10000] (* see A106856 *)

CROSSREFS

Sequence in context: A035410 A290487 A059940 * A175097 A217320 A047105

Adjacent sequences: A106890 A106891 A106892 * A106894 A106895 A106896

KEYWORD

nonn,easy

AUTHOR

T. D. Noe, May 09 2005

STATUS

approved