This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A339957 #7 Dec 25 2020 19:33:44 %S A339957 5,29,149,461,1637,1877,4373,13037,13757,32309,41381,43853,63533, %T A339957 69821,92333,154157,174917,228869,250949,358637,381917,388757,565661, %U A339957 587693,651293,697973,755861,790613,862061,985613,1127309,1180637,1303613,1739981,2147693,2345261,2586989,2684837,2876261 %N A339957 Primes in A240860 (up to sign). %H A339957 Robert Israel, <a href="/A339957/b339957.txt">Table of n, a(n) for n = 1..10000</a> %e A339957 a(3) = 149 is in the sequence because it is prime and A240860(8) = -149. %p A339957 R:= NULL: count:= 0: %p A339957 v:= 0: p:= 1: %p A339957 while count < 100 do %p A339957 p:= nextprime(p); %p A339957 v:= p^2 - v; %p A339957 if isprime(v) then R:= R, v; count:= count+1 fi %p A339957 od: %p A339957 R; %Y A339957 Cf. A240860. %K A339957 nonn %O A339957 1,1 %A A339957 _J. M. Bergot_ and _Robert Israel_, Dec 24 2020