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 A305463 #7 Jun 04 2018 09:48:19 %S A305463 0,1,2,3,4,5,6,7,8,9,22,23,12,13,14,15,10,11,18,19,20,21,28,29,24,25, %T A305463 26,27,16,17,30,31,32,33,124,125,36,37,38,39,202,203,132,133,134,135, %U A305463 130,131,168,169,170,171,58,59,84,85,86,87,76,77,60,61,62,63 %N A305463 Inverse permutation to A305458. %H A305463 Rémy Sigrist, <a href="/A305463/b305463.txt">Table of n, a(n) for n = 0..2310</a> %H A305463 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a><a href="/index/Pri#primorialbase">Index entries for sequences related to primorial base</a> %o A305463 (PARI) a(n) = my (v=0, k=1, r=2, p=1); while (n, my (d=n % r); if (d, my (t = lift(Mod(d, r)/Mod(k, r))); v += t * p; k *= t); n \= r; p *= r; r = nextprime(r+1)); return (v) %Y A305463 Cf. A305458. %K A305463 nonn,base %O A305463 0,3 %A A305463 _Rémy Sigrist_, Jun 01 2018