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 A387640 #7 Sep 04 2025 14:55:00 %S A387640 1,2,3,4,6,5,7,8,9,10,11,14,13,12,15,19,18,17,16,21,20,23,22,30,29,28, %T A387640 27,26,25,24,31,37,36,35,34,33,32,44,43,42,41,40,39,38,46,45,47,54,53, %U A387640 52,51,50,49,48,65,64,63,62,61,60,59,58,57,56,55,68,67 %N A387640 A387523(n) is the a(n)-th prime number. %C A387640 If the conjecture in A387523 is true, then the present sequence is self-inverse. %H A387640 Rémy Sigrist, <a href="/A387640/b387640.txt">Table of n, a(n) for n = 1..10949</a> %H A387640 Rémy Sigrist, <a href="/A387640/a387640.gp.txt">PARI program</a> %F A387640 a(n) = A000720(A387523(n)). %e A387640 a(42) = A000720(A387523(42)) = A000720(173) = 40. %o A387640 (PARI) \\ See Links section. %Y A387640 Cf. A000720, A386482, A387523, A387544. %K A387640 nonn,new %O A387640 1,2 %A A387640 _Rémy Sigrist_, Sep 04 2025