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 A381964 #8 Mar 14 2025 21:20:13
%S A381964 0,1,2,3,4,5,6,7,8,9,11,13,15,17,19,21,23,25,27,30,22,24,26,28,30,32,
%T A381964 34,36,39,42,33,35,37,39,41,43,45,48,51,54,44,46,48,50,52,54,57,60,63,
%U A381964 66,55,57,59,61,63,66,69,72,75,78,66,68,70,72,75,78,81,84,87,90
%N A381964 Row sums of A381963.
%H A381964 Paolo Xausa, <a href="/A381964/b381964.txt">Table of n, a(n) for n = 0..10000</a>
%F A381964 a(n) = Sum_{k = 0..A031286(n)} A381963(n,k).
%t A381964 A381964[n_] := Total[NestWhileList[DigitSum, n, # >= 10 &]];
%t A381964 Array[A381964, 100, 0]
%Y A381964 Cf. A031286, A381963.
%K A381964 nonn,base,easy
%O A381964 0,3
%A A381964 _Paolo Xausa_, Mar 11 2025