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 A073303 #6 Aug 23 2021 21:48:52 %S A073303 0,4,6,8,9,10,13,15,16,17,21,24,25,27,28,29,31,33,39,43,46,47,48,51, %T A073303 53,56,61,63,64,66,73,76,83,86,89,90,91,93,96,99,102,109,111,112,114, %U A073303 115,120,123,130,131,133,135,136,137,139,140,141,142,143,149,156 %N A073303 Indices of prime digits in the decimal expansion of Pi. %H A073303 Harvey P. Dale, <a href="/A073303/b073303.txt">Table of n, a(n) for n = 0..10000</a> %e A073303 Pi=3.141592653, so the indices of prime digits are 0,4,6,8,9... %t A073303 Flatten[Position[RealDigits[Pi,10,200][[1]],_?PrimeQ]]-1 (* _Harvey P. Dale_, Oct 01 2013 *) %Y A073303 Cf. A000796, A073264. %K A073303 easy,nonn,base %O A073303 0,2 %A A073303 Y. Kelly Itakura (yitkr(AT)mta.ca), Aug 22 2002 %E A073303 More terms from _Harvey P. Dale_, Oct 01 2013