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 A152589 #6 Aug 02 2021 12:23:06 %S A152589 17,227,50627,6568408355712890627 %N A152589 Primes of the form 15^(2^k) + 2. %o A152589 (PARI) g(a,n) = if(a%2, b=2, b=1); for(x=0, n, y=a^(2^x)+b; if(ispseudoprime(y), print1(y, ", "))) %o A152589 g(15, 4) %Y A152589 Cf. A057726, A152588. %K A152589 nonn %O A152589 1,1 %A A152589 _Cino Hilliard_, Dec 08 2008