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 A234853 #10 Jan 05 2014 16:50:42 %S A234853 2,3,4,5,6,7,9,11,12,13,15,16,18,19,20,22,26,27,29,30,34,35,37,40,44, %T A234853 46,48,50,53,54,55,59,60,61,62,68,76,79,80,81,85,89,91,94,96,99,100, %U A234853 102,110,111,112,117,122,123,125,126,134,138,139,141,144,147 %N A234853 Indices of primes in A234851. %o A234853 (PARI) c=0;for(k=1,1999,isprime(prime(k)-k+1)&&c++&&isprime(k)&&print1(c", ")) %Y A234853 Cf. A000040, A000720, A014692, A234850, A234851, A234852, A234695. %K A234853 nonn %O A234853 1,1 %A A234853 _M. F. Hasler_, Dec 31 2013