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 A249505 #12 Aug 10 2017 11:13:28 %S A249505 3,5,7,11,17,19,23,29,31,41,43,47,53,59,71,79,83,101,103,107,109,127, %T A249505 131,137,139,149,163,167,179,191,197,199,211,223,227,239,251,263,269, %U A249505 271,281,293,311,331,347,359,367,379,383,419,431,439,443,461,463,467,479,491,499,503 %N A249505 Primes p such that p+1 is a totient (i.e., in A000010). %C A249505 Primes of the form phi(m) - 1 for some m. A001359 is a subsequence. - _Thomas Ordowski_, Aug 10 2017 %H A249505 Charles R Greathouse IV, <a href="/A249505/b249505.txt">Table of n, a(n) for n = 1..10000</a> %o A249505 (PARI) select(p->istotient(p+1), primes(200)) %Y A249505 Cf. A000010, A078892. %K A249505 nonn %O A249505 1,1 %A A249505 _Joerg Arndt_, Oct 30 2014