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 A259153 #14 Aug 02 2018 16:27:50 %S A259153 0,1,2,3,5,4,7,11,13,6,17,19,23,29,10,31,8,9,37,41,43,14,47,53,59,61, %T A259153 15,67,12,71,22,73,79,83,89,26,97,21,101,103,107,109,25,113,34,127,16, %U A259153 20,131,18,137,139,38,149,151,33,157,163,167,173,35,46,179 %N A259153 Triangle T(n,k) in which n-th row lists in increasing order the values v whose pi-based arithmetic derivative equals n; n>=0, 1<=k<=A259154(n). %H A259153 Alois P. Heinz, <a href="/A259153/b259153.txt">Rows n = 0..12000, flattened</a> %F A259153 A258851(T(n,k)) = n. %F A259153 T(n,1) = A258861(n). %F A259153 T(n,A259154(n)) = A008578(n+1). %F A259153 T(n,A259154(n)) = A000040(n) for n>0. %e A259153 Triangle T(n,k) begins: %e A259153 0, 1; %e A259153 2; %e A259153 3; %e A259153 5; %e A259153 4, 7; %e A259153 11; %e A259153 13; %e A259153 6, 17; %e A259153 19; %e A259153 23; %e A259153 29; %e A259153 10, 31; %e A259153 8, 9, 37; %Y A259153 Column k=1 gives A258861. %Y A259153 Last elements of rows give A008578(n+1). %Y A259153 Row lengths give A259154. %Y A259153 Row sums give A259155. %Y A259153 Cf. A000040, A000720, A258851. %K A259153 nonn,tabf %O A259153 0,3 %A A259153 _Alois P. Heinz_, Jun 19 2015