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 A140853 #22 Apr 07 2015 13:51:57
%S A140853 1,2,6,12,28,36,52,60,78,106,112,150,172,180,198,238,270,280,316,348,
%T A140853 358,396,420,456,502,540,556,576,592,612,700,732,768,786,856,862,910,
%U A140853 952,982,1020,1060,1068,1150,1162,1192,1212,1290,1398,1428,1438,1458
%N A140853 a(n) = prime(prime(n) - 1) - 1, where prime(n) is the n-th prime.
%H A140853 Charles R Greathouse IV, <a href="/A140853/b140853.txt">Table of n, a(n) for n = 1..10000</a>
%F A140853 a(n) = A055003(n) - 1. - _N. J. A. Sloane_, Jul 31 2008
%F A140853 a(n) ~ n (log n)^2. - _Charles R Greathouse IV_, Apr 07 2015
%t A140853 Table[Prime[Prime[n - 1] - 1] - 1, {n, 2, 60}] (* _Vincenzo Librandi_, Apr 05 2015 *)
%o A140853 (PARI) apply(p->prime(p-1)-1, primes(100))
%Y A140853 Cf. A006093, A055003.
%K A140853 nonn,easy
%O A140853 1,2
%A A140853 _Juri-Stepan Gerasimov_, Jul 30 2008
%E A140853 Corrected (382 replaced by 396) and extended by _R. J. Mathar_, Apr 27 2010