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 A175247 #14 Jan 26 2023 11:30:10 %S A175247 2,3,5,11,17,31,41,59,67,83,109,127,157,179,191,211,241,277,283,331, %T A175247 353,367,401,431,461,509,547,563,587,599,617,709,739,773,797,859,877, %U A175247 919,967,991,1031,1063,1087,1153,1171,1201,1217,1297,1409,1433,1447 %N A175247 Primes (A000040) with noncomposite (A008578) subscripts. %C A175247 A006450 is the main entry for these numbers. [_Arkadiusz Wesolowski_, Mar 12 2011] %F A175247 a(n) U A007821(n+1) = A000040(n) for n >= 1. a(n) = prime(noncomposite(n)) = A000040(A008578(n)). a(1) = 2, a(n) = A006450(n-1) for n >= 2. %e A175247 a(5) = 17 because a(5) = p(q(5)) = p(7) = 17, p = prime, q = noncomposite. %Y A175247 Cf. A006450, A000040. %K A175247 nonn %O A175247 1,1 %A A175247 _Jaroslav Krizek_, Mar 13 2010