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 A198196 #14 Nov 12 2019 11:33:46 %S A198196 2,3,5,7,11,13,17,19,79,151,199,233,251,317,863,971 %N A198196 Numbers k such that [V(4,1,k)/4] = floor(cosh(k log(sqrt(3)+2))/2) = A004526(A001075(k)) is a prime. %C A198196 Further terms are 3049, 7451, 7487, 18869. %C A198196 All terms must be primes. A117808 lists the corresponding primes floor(A001075(k)/2). Actually, the "floor" here and in the definition is only needed for the initial term 2, since no other even (thus composite) k can be in the sequence, and A001075(k) is even for odd k. %H A198196 D. Broadhurst, <a href="http://groups.yahoo.com/group/primenumbers/message/23490">Re: Cubic factors of n^n+(n+1)^(n+1)</a>, in "primenumbers" Yahoo group, Oct 21 2011. %H A198196 David Broadhurst, <a href="/A198196/a198196.txt">Cubic factors of n^n+(n+1)^(n+1)</a>, digest of 3 messages in primenumbers Yahoo group, Oct 21 - Oct 22, 2011. %o A198196 (PARI) q=2+quadgen(12); for(n=1,1e9, ispseudoprime(real(q^n)\2) & print1(n",")) %K A198196 nonn,more %O A198196 1,1 %A A198196 _M. F. Hasler_, Oct 21 2011