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A176557 Primes of the form 7*x^2 - 5*y^2, where x and y are successive natural numbers. 2
7, 23, 43, 67, 127, 163, 347, 463, 743, 823, 907, 1087, 1283, 1607, 1723, 2503, 2647, 3767, 3943, 5923, 6143, 6367, 6827, 7547, 8563, 9643, 9923, 11083, 11383, 13267, 14947, 15647, 16363, 17467, 18223, 19387, 20183, 21407, 24847, 25747, 26203 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(n) is congruent 3 mod 4.

Primes of the form 2x^2+10x-5, x>=1. [From R. J. Mathar and Vincenzo Librandi, Apr 21 2010]

LINKS

Table of n, a(n) for n=1..41.

CROSSREFS

Cf. A176470

Sequence in context: A031095 A319050 A031371 * A000353 A097149 A185007

Adjacent sequences:  A176554 A176555 A176556 * A176558 A176559 A176560

KEYWORD

nonn

AUTHOR

Giovanni Teofilatto, Apr 20 2010

EXTENSIONS

More terms from R. J. Mathar and Vincenzo Librandi, Apr 21 2010

STATUS

approved

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Last modified August 8 11:31 EDT 2020. Contains 336298 sequences. (Running on oeis4.)