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 A127439 #13 Dec 27 2021 10:57:13 %S A127439 2,2,1,2,1,2,2,1,2,2,2,1,2,2,4,2,1,2,2,4,2,2,1,2,2,4,2,4,2,1,2,2,4,2, %T A127439 4,2,2,1,2,2,4,2,4,2,4,2,1,2,2,4,2,4,2,4,6,2,1,2,2,4,2,4,2,4,6,2,2,1, %U A127439 2,2,4,2,4,2,4,6,2,6,2,1,2,2,4,2,4,2,4,6,2,6,4 %N A127439 Triangle read by rows, in which row n consists of first n terms of A054541. %C A127439 Rows tend to A054541: (2, 1, 2, 2, 4, 2, 4, ...) %e A127439 prime(5) = 2 + 1 + 2 + 2 + 4 = 11. %e A127439 From _Omar E. Pol_, Dec 23 2021: (Start) %e A127439 Triangle begins: %e A127439 2; %e A127439 2, 1; %e A127439 2, 1, 2; %e A127439 2, 1, 2, 2; %e A127439 2, 1, 2, 2, 4; %e A127439 2, 1, 2, 2, 4, 2; %e A127439 2, 1, 2, 2, 4, 2, 4; %e A127439 2, 1, 2, 2, 4, 2, 4, 2; %e A127439 2, 1, 2, 2, 4, 2, 4, 2, 4; %e A127439 2, 1, 2, 2, 4, 2, 4, 2, 4, 6; %e A127439 2, 1, 2, 2, 4, 2, 4, 2, 4, 6, 2; %e A127439 2, 1, 2, 2, 4, 2, 4, 2, 4, 6, 2, 6; %e A127439 2, 1, 2, 2, 4, 2, 4, 2, 4, 6, 2, 6, 4; %e A127439 ... (End) %Y A127439 Row sums give A000040. %Y A127439 Cf. A054541, A001223. %K A127439 nonn,tabl,easy %O A127439 1,1 %A A127439 _Gary W. Adamson_, Jan 14 2007 %E A127439 Edited by _N. J. A. Sloane_, Jan 27 2007 %E A127439 More terms from _Omar E. Pol_, Feb 21 2014