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 A172052 #4 Jul 12 2012 00:39:51 %S A172052 1,18,21,26,27,26,29,31,32,31,32,39,39,46,48,48,44,45,45,46,36,39,39, %T A172052 32,35,32,31,29,29,6,8,11,7,7,10,5,4,3,6,13,25,24,25,26,27,42,41,40, %U A172052 39,57,58,59,61,64,74,87,87,91,93,99,102,103,102,101,102,101,108,106,111,115 %N A172052 a(n)=abs(A171696(n)-A002822(n)). %C A172052 Abs(n-th nonnegative number such that neither 6*k+-1 is prime minus n-th number such that 6*m+-1 are both twin primes). %Y A172052 Cf. A002808, A171696. %K A172052 nonn %O A172052 1,2 %A A172052 _Juri-Stepan Gerasimov_, Jan 24 2010 %E A172052 a(65) and terms from a(67) on corrected by _R. J. Mathar_, May 22 2010