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 A262378 #4 Sep 21 2015 11:48:41 %S A262378 2,3,5,7,11,20,23,26,27,34,37,39,40,50,54,55,70,74,76,77,86,87,88,95, %T A262378 100,103,104,107,113,115,119,122,127,129,133,137,147,153,154,171,192, %U A262378 200,201,211,215,216,218,227,229,238,253,258,266,267,269,286,287 %N A262378 Positions of prime numbers in A262358. %C A262378 A262377(n) = A262358(a(n)). %H A262378 Reinhard Zumkeller, <a href="/A262378/b262378.txt">Table of n, a(n) for n = 1..400</a> %o A262378 (Haskell) %o A262378 a262378 n = a262378_list !! (n-1) %o A262378 a262378_list = filter ((== 1) . a010051' . a262358) [1..] %Y A262378 Cf. A262358, A010051, A262377. %K A262378 nonn %O A262378 1,1 %A A262378 _Reinhard Zumkeller_, Sep 20 2015