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 A277907 #11 Nov 07 2016 09:12:06 %S A277907 5,7,11,13,17,19,41,43,59,61,67,71,97,101,103,107,109,113,127,131,137, %T A277907 139,149,151,179,181,191,193,197,199,227,229,269,271,277,281,307,311, %U A277907 313,317,347,349,379,383,419,421,431,433,439,443,461,463,487,491,499,503,599,601,617,619,643,647,739,743,823,827,853,857,859,863,877,881 %N A277907 a(n) = A007310(A277908(n)). %C A277907 It seems that all terms are primes, and moreover, that all those primes occur in pairs with distance of 2 or 4. However, not all terms of A001359 are present. %H A277907 Antti Karttunen, <a href="/A277907/b277907.txt">Table of n, a(n) for n = 1..7096</a> %F A277907 a(n) = A007310(A277908(n)). %o A277907 (Scheme) (define (A277907 n) (A007310 (A277908 n))) %Y A277907 Cf. A000040, A001359, A007310, A118306, A277908, A277911. %K A277907 nonn %O A277907 1,1 %A A277907 _Antti Karttunen_, Nov 05 2016