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 A123705 #5 Nov 21 2013 12:49:00
%S A123705 609554401,9536162033329,5960417405949649,2328306127701998147089,
%T A123705 355271367866755685756083382145169,
%U A123705 29387358770557187699218413428591111182510208390715375894150039546014062887655539136439569
%N A123705 Primes of the form (5^p-3^p)/2, where prime p = Prime[A123704[n]] = A121877[n].
%C A123705 Corresponding primes p are listed in A121877[n] = Prime[A123704[n]] = {13, 19, 23, 31, 47, 127, 223, 281, 2083, ...} Numbers n such that (5^n-3^n)/2 is a prime. Numbers n such that (5^p-3^p)/2 is prime, where p = Prime[n], are listed in A123704[n] = {6, 8, 9, 11, 15, 31, 48, 60, 314, ...}.
%t A123705 Select[(5^#-3^#)/2&/@Prime[Range[50]],PrimeQ] (* _Harvey P. Dale_, Mar 30 2012 *)
%Y A123705 Cf. A123704, A121877.
%K A123705 nonn
%O A123705 1,1
%A A123705 _Alexander Adamchuk_, Oct 08 2006