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 A106881 Primes of the form x^2+xy+9y^2. 7
 11, 29, 71, 79, 109, 149, 151, 179, 191, 211, 239, 281, 331, 359, 379, 389, 401, 421, 431, 449, 491, 499, 541, 569, 571, 599, 631, 641, 659, 701, 709, 739, 751, 809, 821, 911, 919, 991, 1009, 1019, 1031, 1051, 1061, 1129, 1171, 1201, 1229, 1289, 1381 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Discriminant=-35. Also, primes of the form x^2-xy+9y^2, with x and y nonnegative. Also, primes which are squares (mod 35). A subsequence of A191026. - M. F. Hasler, Jan 15 2016 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[1, -1, 9, 10000] (* see A106856 *) PROG (PARI) select(p->issquare(Mod(p, 35))&&isprime(p), [1..1000]) \\ M. F. Hasler, Jan 15 2016 CROSSREFS Primes in A243178. Sequence in context: A120946 A216296 A099909 * A239734 A106880 A275475 Adjacent sequences:  A106878 A106879 A106880 * A106882 A106883 A106884 KEYWORD nonn,easy AUTHOR T. D. Noe, May 09 2005 STATUS approved

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Last modified May 19 20:39 EDT 2019. Contains 323407 sequences. (Running on oeis4.)