

A140619


Primes of the form 19x^2+4xy+28y^2.


2



19, 43, 139, 211, 283, 307, 523, 547, 571, 739, 787, 811, 1051, 1459, 1531, 1579, 1627, 1723, 1867, 1987, 2131, 2251, 2371, 2659, 2683, 2851, 3163, 3187, 3307, 3571, 3643, 3691, 3739, 3907, 4003, 4099, 4219, 4243, 4363, 4483, 4507, 5011
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OFFSET

1,1


COMMENTS

Discriminant=2112. Also primes of the form 19x^2+10xy+43y^2.
In base 12, the sequence is 17, 37, E7, 157, 1E7, 217, 377, 397, 3E7, 517, 557, 577, 737, X17, X77, XE7, E37, EE7, 10E7, 1197, 1297, 1377, 1457, 1657, 1677, 1797, 19E7, 1X17, 1XE7, 2097, 2137, 2177, 21E7, 2317, 2397, 2457, 2537, 2557, 2637, 2717, 2737, 2X97, where X is for 10 and E is for 11. Moreover, the discriminant is 1280.  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, 4, 28, 10000], QuadPrimes2[19, 4, 28, 10000]] (* see A106856 *)


CROSSREFS

Cf. A140633.
Sequence in context: A165567 A205533 A185167 * A229765 A058829 A063313
Adjacent sequences: A140616 A140617 A140618 * A140620 A140621 A140622


KEYWORD

nonn,easy


AUTHOR

T. D. Noe, May 19 2008


STATUS

approved



