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A106973 Primes of the form 5x^2-4xy+5y^2, with x and y nonnegative. 1
5, 17, 41, 257, 269, 293, 353, 509, 521, 677, 761, 797, 857, 881, 929, 941, 1097, 1109, 1181, 1217, 1361, 1433, 1553, 1613, 1637, 1721, 1949, 2141, 2273, 2357, 2477, 2609, 2693, 2777, 2789, 2861, 2897, 3041, 3209, 3449, 3461, 3533, 3821 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Discriminant=-84.

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[5, -4, 5, 10000] (* see A106856 *)

CROSSREFS

Sequence in context: A273116 A273945 A111268 * A102264 A122035 A052350

Adjacent sequences:  A106970 A106971 A106972 * A106974 A106975 A106976

KEYWORD

nonn,easy

AUTHOR

T. D. Noe, May 09 2005

STATUS

approved

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Last modified February 22 04:55 EST 2020. Contains 332115 sequences. (Running on oeis4.)