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 A055074 #6 Oct 27 2019 00:11:49 %S A055074 3,4,5,7,8,9,12,17,19,20,21,22,29,30,33,39,47,49,64,65,71,72,76,77,83, %T A055074 91,102,103,106,113,114,115,120,122,129,142,155,156,157,173,174,175, %U A055074 179,180,185,186,193,194,197,198,203,204,225,233,245,249,264,265,267 %N A055074 Pointers to base-2 digits where primes occur in A054633. %e A055074 01101110010111011110001001101010111100110111101111... %e A055074 --|.... sum 0+1+1 = prime 2 at position 3 %e A055074 ---|... sum 0+1+1+0 = prime 2 at position 4 %e A055074 ----|.. sum 0+1+1+0+1 = prime 3 at position 5 %e A055074 ------| sum 0+1+1+0+1+1+1 = prime 5 at position 7 %Y A055074 Cf. A000040, A055059-A055073. %K A055074 nonn,base %O A055074 1,1 %A A055074 _Patrick De Geest_, Apr 15 2000