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 A241542 #14 Sep 03 2024 08:25:27 %S A241542 1,2,4,30,189,217,2225,3385,14357,30802,31545,104071,149689,1094421, %T A241542 1319945,10655462,23163298,112228683,182837804,203615628,486570087, %U A241542 1094330259,11992433550,17883926781,50070452577,52302956123,72178455400,94906079600,473258870471,662221289043 %N A241542 Indices (i.e., value of A000720 = primepi) of primes in A111870. %H A241542 Amiram Eldar, <a href="/A241542/b241542.txt">Table of n, a(n) for n = 1..32</a> (calculated using Kim Walisch's primecount) %H A241542 Kim Walisch, <a href="https://github.com/kimwalisch/primecount">Fast C++ prime counting function implementation (primecount)</a>. %F A241542 a(n) = A000720(A111870(n)). %Y A241542 Cf. A000720, A111870. %K A241542 nonn %O A241542 1,2 %A A241542 _M. F. Hasler_, Apr 25 2014 %E A241542 a(20)-a(30) from _Amiram Eldar_, Sep 03 2024