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 A181694 #2 Mar 30 2012 18:52:44 %S A181694 0,1,2,3,4,5,8,9,6,7,10,11,14,15,12,13,16,17,20,21,18,19,22,23,24,29, %T A181694 30,25,28,31,38,39,26,27,32,37,40,33,36,41,44,45,34,35,42,43,46,55,56, %U A181694 47,54,57,48,53,58,63,64,49,52,59,62,65,50,51,60,61,66,67,68,71,72,69,70 %N A181694 Array read by rows in which row n lists the numbers that are in the same "y" level in the primes (version 2). %C A181694 Where version 1 is A162343. %e A181694 Array begins: . . . . . . . . . . . . . . %e A181694 0 . . . . . . . . . . . . . . . . . . %e A181694 1 . . . . . . . . . . . . . . . . . . %e A181694 2 3 4 . . . . . . . . . . . . . . . . %e A181694 . . 5 8 9 . . . . . . . . . . . . . . %e A181694 . . 6 7 10 . . . . . . . . . . . . . . %e A181694 . . . . 11 14 15 . . . . . . . . . . . . %e A181694 . . . . 12 13 16 . . . . . . . . . . . . %e A181694 . . . . . . 17 20 21 . . . . . . . . . . %e A181694 . . . . . . 18 19 22 . . . . . . . . . . %e A181694 . . . . . . . . 23 . . . . . . . . . . %e A181694 . . . . . . . . 24 29 30 . . . . . . . . %e A181694 . . . . . . . . 25 28 31 38 39 . . . . . . %e A181694 . . . . . . . . 26 27 32 37 40 . . . . . . %e A181694 . . . . . . . . . . 33 36 41 44 45 . . . . %e A181694 . . . . . . . . . . 34 35 42 43 46 55 56 . . %e A181694 . . . . . . . . . . . . . . 47 54 57 . . %e A181694 . . . . . . . . . . . . . . 48 53 58 63 64 %e A181694 . . . . . . . . . . . . . . 49 52 59 62 65 %e A181694 . . . . . . . . . . . . . . 50 51 60 61 66 %e A181694 . . . . . . . . . . . . . . . . . . 67 %K A181694 nonn,tabf %O A181694 1,3 %A A181694 _Juri-Stepan Gerasimov_, Nov 05 2010