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A176557 Primes of the form 7*x^2 - 5*y^2, where x and y are successive natural numbers. 2

%I

%S 7,23,43,67,127,163,347,463,743,823,907,1087,1283,1607,1723,2503,2647,

%T 3767,3943,5923,6143,6367,6827,7547,8563,9643,9923,11083,11383,13267,

%U 14947,15647,16363,17467,18223,19387,20183,21407,24847,25747,26203

%N Primes of the form 7*x^2 - 5*y^2, where x and y are successive natural numbers.

%C a(n) is congruent 3 mod 4.

%C Primes of the form 2x^2+10x-5, x>=1. [From _R. J. Mathar_ and _Vincenzo Librandi_, Apr 21 2010]

%Y Cf. A176470

%K nonn

%O 1,1

%A _Giovanni Teofilatto_, Apr 20 2010

%E More terms from _R. J. Mathar_ and _Vincenzo Librandi_, Apr 21 2010

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Last modified September 26 05:46 EDT 2022. Contains 356986 sequences. (Running on oeis4.)