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 A257347 #5 Apr 30 2015 20:45:19 %S A257347 1,2,3,5,7,11,4,6,9,13,17,19,23,25,29,8,15,21,31,35,14,37,41,43,47,27, %T A257347 49,16,12,10,33,53,59,39,61,67,22,20,18,45,65,71,73,79,83,24,51,55,26, %U A257347 85,77,89,97,32,57,91,101,95,28,69,103,107 %N A257347 1 followed by the numbers successively added to the four arms of the spirals in A257329, A257330, A257331, A257332. %C A257347 Conjectured to be a permutation of the natural numbers. %H A257347 Popular Computing (Calabasas, CA), <a href="/A257321/a257321.png">Problem 146: Gcd</a>, Vol. 4 (No. 45, Dec 1976), page PC45-4. %H A257347 N. J. A. Sloane, <a href="/A257321/a257321_1.png">Spirals showing initial terms of A257321-A257332</a> %Y A257347 Cf. A257329, A257330, A257331, A257332. %K A257347 nonn %O A257347 1,2 %A A257347 _N. J. A. Sloane_, Apr 30 2015