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 A175248 #4 May 01 2013 21:06:46 %S A175248 1,2,3,7,13,29,37,53,61,79,107,113,151,173,181,199,239,271,281,317, %T A175248 349,359,397,421,457,503,541,557,577,593,613,701,733,769,787,857,863, %U A175248 911,953,983,1021,1061,1069,1151,1163,1193,1213,1291,1399,1429,1439,1459 %N A175248 Noncomposites (A008578) with noncomposite (A008578) subscripts. %C A175248 Noncomposite numbers of order 2. %C A175248 a(n) = noncomposite(noncomposite(n)) = A008578(A008578(n)). a(1) = 1, a(n) = A055003(n) for n >=2. a(n) U A175249(n+1) = A008578 for n >= 1. %F A175248 a(n)=A008578(A008578(n)). %e A175248 a(5) = 13 because a(5) = q(q(5)) = q(7) = 13, q = noncomposite. %Y A175248 Cf. A006450, A102615. %K A175248 nonn %O A175248 1,2 %A A175248 _Jaroslav Krizek_, Mar 13 2010 %E A175248 More terms from _Juri-Stepan Gerasimov_, Apr 15 2010 %E A175248 Edited by _N. J. A. Sloane_, Apr 21 2010 at the suggestion of R. J. Mathar