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 A182872 #5 Mar 30 2012 18:57:12 %S A182872 1,4,2,16,20,3,25,29,24,5,31,45,33,26,6,40,55,52,43,27,7,51,71,63,59, %T A182872 49,28,8,57,83,79,78,65,50,30,9,66,97,92,95,84,68,53,32,10,76,111,108, %U A182872 113,104,87,75,54,34,11,81,123,122,131,120,105,93,77,56 %N A182872 Joint-rank array of the numbers p^j, where p is a prime congruent to 1 mod 4 and j>=1, read by antidiagonals. %C A182872 Joint-rank arrays are defined in the first comment at A182801. A182872 is a permutation of the positive integers. %e A182872 Northwest corner: %e A182872 1....4...16...25... %e A182872 2...20...29...45... %e A182872 3...24...33...52... %e A182872 5...26...43...59... %Y A182872 Cf. A182801, A182869, A182870, A182871. %K A182872 nonn,tabl %O A182872 1,2 %A A182872 _Clark Kimberling_, Dec 09 2010