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A140624
Primes of the form 19x^2+14xy+91y^2.
1
19, 139, 619, 691, 811, 859, 1291, 1459, 1531, 1699, 2131, 2371, 2539, 2659, 2971, 3331, 3499, 4051, 4219, 4339, 4651, 5011, 5059, 5179, 5659, 5851, 6571, 6691, 7411, 7699, 8011, 8179, 8419, 8539, 9091, 9859, 9931, 10099, 10531, 10771, 10891
OFFSET
1,1
COMMENTS
Discriminant=-6720. Also primes of the form 19x^2+16xy+136y^2.
In base 12, the sequence is 17, E7, 437, 497, 577, 5E7, 8E7, X17, X77, E97, 1297, 1457, 1577, 1657, 1877, 1E17, 2037, 2417, 2537, 2617, 2837, 2X97, 2E17, 2EE7, 3337, 3477, 3977, 3X57, 4357, 4557, 4777, 4897, 4X57, 4E37, 5317, 5857, 58E7, 5X17, 6117, 6297, 6377, where X is 10 and E is 11. Moreover, the discriminant is -3X80. - Walter Kehowski, Jun 01 2008
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
Union[QuadPrimes2[19, 14, 91, 10000], QuadPrimes2[19, -14, 91, 10000]] (* see A106856 *)
CROSSREFS
Cf. A140633.
Sequence in context: A142746 A221226 A139902 * A244505 A235146 A057636
KEYWORD
nonn,easy
AUTHOR
T. D. Noe, May 19 2008
STATUS
approved