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 A068419 #14 Jan 03 2017 02:27:37
%S A068419 5,11,7,23,11,47,79,73,67,23,191,283,383,739,47,1459,281,607,59,1153,
%T A068419 1069,3319,83,1801,2671,3517,743,107,6679,3529,6619,6143,6271,4153,
%U A068419 10169,9817,167,6451,179,24097,23539,10369,227,263,16369,41203,20809,54919
%N A068419 Odd prime values of sigma(k) - phi(k) taking k in increasing order.
%e A068419 sigma(2312) - phi(2312) = 3517 is prime, so is in the sequence.
%o A068419 (PARI) lista(nn) = {for (k = 1, nn, if (isprime(p = (sigma(k) - eulerphi(k))) && (p % 2), print1(p, ", ")););} \\ _Michel Marcus_, Nov 24 2013
%Y A068419 Cf. A051612.
%K A068419 easy,nonn
%O A068419 1,1
%A A068419 _Benoit Cloitre_, Mar 02 2002
%E A068419 Terms 3517, 10169, 9817 added by _Michel Marcus_, Nov 24 2013