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 A251965 #26 Mar 24 2015 04:30:48 %S A251965 1,5,11,13,14,31 %N A251965 Indices of primes in A055729(m), where A055729(m) is the number of primes <= 3^m. %C A251965 A055729 is the sequence primepi(3^n). A087865 are the terms of A055729 that are prime. a(n) is the index of the n-th prime term in A055729. %e A251965 1 is a term since A055729(1) = 2 is prime. %e A251965 The next prime appearing in A055729 is 53, which occurs at index 5, so a(2)=5. %t A251965 Select[Range@49,PrimeQ[PrimePi[3^#]]&] %Y A251965 Cf. A055729, A087865. %K A251965 nonn,more %O A251965 1,2 %A A251965 _David Baugh_, Mar 21 2015