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 A316915 #10 Jul 26 2019 18:51:58 %S A316915 10,100,11,13,14,16,18,20,12,23,26,29,32,35,39,24,46,51,45,40,67,74, %T A316915 27,19,21,90,101,30,41,106,15,61,17,31,33,37,84,50,56,62,69,47,81,91, %U A316915 102,60,71,92,22,28,112,34,42,25,52,117,72,82,38,95,80,103,43,73,133,36,93,53,63,70,78,83,59,49,104 %N A316915 For any k, the cumulative sum a(1) + a(2) + a(3) + ... + a(k) shares at least two digits with a(k). Lexicographic first sequence of positive integers without duplicate terms having this property. %H A316915 Jean-Marc Falcoz, <a href="/A316915/b316915.txt">Table of n, a(n) for n = 1..10001</a> %e A316915 Here are the first terms of the sequence: %e A316915 10,100,11,13,14,16,18,20,12,23,26,29,32,... %e A316915 and here are the cumulative sums: %e A316915 10,110,121,134,148,162,180,200,212,235,261,290,322,... %e A316915 If we align a(n) and its cumulative sum, we see that at least two digits are shared: %e A316915 10,100, 11, 13, 14, 16, 18, 20, 12, 23, 26, 29, 32,... %e A316915 10,110,121,134,148,162,180,200,212,235,261,290,322,... %Y A316915 Cf. A316914 (where one digit is shared instead of two, by the cumulative sum). %K A316915 base,nonn %O A316915 1,1 %A A316915 _Eric Angelini_ and _Jean-Marc Falcoz_, Jul 16 2018