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 A081717 #11 Oct 05 2024 04:33:36
%S A081717 5,11,17,19,23,29,31,37,41,43,47,53,59,67,71,73,83,97,103,107,109,113,
%T A081717 127,137,149,151,157,163,167,173,179,191,193,197,199,211,227,229,233,
%U A081717 239,241,251,257,263,269,271,277,281,283,293,307,311,313,331,337,347
%N A081717 Primes prime(j) such that prime(j) + j is composite.
%H A081717 Amiram Eldar, <a href="/A081717/b081717.txt">Table of n, a(n) for n = 1..10000</a>
%e A081717 127 is the 31st prime and 127+31 = 158 is composite.
%t A081717 Do[s=Prime[n]+n; If[ !PrimeQ[s], Print[Prime[n]]], {n, 1, 100}]
%Y A081717 Cf. A061067, A061068.
%K A081717 nonn
%O A081717 1,1
%A A081717 _Labos Elemer_, Apr 02 2003