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 A212222 #25 May 09 2021 22:11:58 %S A212222 0,1,1386,1387,485353,981435,4423035,14187855,19652536,19652537, %T A212222 19654636,19654637,23059876,23059877,23063359,23837177,25009516, %U A212222 25009517,41185278,41185279,41409018,41409019,49650315,50262556,50262557,58622956,58622957,58623315 %N A212222 Integers whose sum of digits in base b is the same for every prime b up to 11. %C A212222 This sequence is a subsequence of A135127 for bases 2,3,5,7, which is a subsequence of A135121 for bases 2,3,5, which is a subsequence of A037301 for bases 2,3. %C A212222 Problem: Is the sequence finite? %H A212222 Thomas König, <a href="/A212222/b212222.txt">Table of n, a(n) for n = 1..21843</a> (terms from n = 1..206 by Stanislav Sykora). %H A212222 Thomas König, <a href="/A212222/a212222.f90.txt">Fortran program for calculating terms</a> %e A212222 1386 = 10101101010_2 = 1220100_3 = 21021_5 = 4020_7 = 1050_11. In each of these bases, the sum of the digits is 6. %Y A212222 Cf. A135127, A135121, A037301. %K A212222 nonn,base %O A212222 1,3 %A A212222 _Stanislav Sykora_, May 06 2012 %E A212222 Offset corrected by _Thomas König_, Aug 16 2020 %E A212222 Name edited by _Michel Marcus_, Aug 17 2020