A276471 - OEIS

%I #45 Nov 13 2020 11:40:12

%S -61,-59,-53,-43,-29,-11,11,37,67,101,139,181,227,277,331,389,587,661,

%T 739,821,907,997,1091,1291,1621,1861,1987,2251,2389,2531,2677,3301,

%U 3467,3637,3989,4357,4547,5347,5557,6211,7877,8389,9187,9461,9739,10597,10891,11491,12107,12421,12739

%N Numbers m of the form 2*k^2 - 61 which are +-1 times a prime.

%C Note that -61 = (-1)*61 is not a prime. - _N. J. A. Sloane_, Nov 13 2020

%e 2*(0)^2 - 61 = -61, and 61 is a prime

%e 2*(1)^2 - 61 = -59, and 59 is a prime

%o (PARI) is(n)=isprime(abs(n)) && n%2 && issquare((n-61)/2) \\ _Charles R Greathouse IV_, Sep 13 2016

%K sign

%O 1,1

%A _Charles Kusniec_, Sep 12 2016

%E More terms from _Charles R Greathouse IV_, Sep 13 2016

%E Definition revised by _N. J. A. Sloane_, Nov 13 2020