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 A064959 #15 Jul 02 2025 23:17:42 %S A064959 1,2,3,4,5,11,23,18,14,6,33,12,40,24,7,19,62,13,68,8,25,34,87,17,9,41, %T A064959 15,26,104,10,111,20,35,63,22,16,133,69,42,21,144,27,162,36,30,88,172, %U A064959 28,47,31,64,43,197,29,32,46,70,105,215,38,237,112,48,52,39,37,248,65 %N A064959 Inverse permutation to A064419. %H A064959 Reinhard Zumkeller, <a href="/A064959/b064959.txt">Table of n, a(n) for n = 1..10000</a> %H A064959 J. C. Lagarias, E. M. Rains and N. J. A. Sloane, <a href="http://arXiv.org/abs/math.NT/0204011">The EKG sequence</a>, Exper. Math. 11 (2002), 437-446. %H A064959 <a href="/index/Ed#EKG">Index entries for sequences related to EKG sequence</a> %H A064959 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %o A064959 (Haskell) %o A064959 import Data.List (elemIndex) %o A064959 import Data.Maybe (fromJust) %o A064959 a064959 n = a064959_list !! (n-1) %o A064959 a064959_list = map ((+ 1) . fromJust . (`elemIndex` a064419_list)) [1..] %o A064959 -- _Reinhard Zumkeller_, Sep 17 2001 %Y A064959 Cf. A064419, A064413. %K A064959 nonn,easy %O A064959 1,2 %A A064959 _N. J. A. Sloane_, Oct 30 2001 %E A064959 More terms from _Naohiro Nomoto_, Oct 31 2001