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 A295389 #26 Jul 25 2021 02:38:02 %S A295389 1,2,3,5,6,7,10,11,12,14,15,16,19,20,21,23,24,25,28,29,30,32,33,34,37, %T A295389 38,41,42,43,46,47,49,50,51,52,55,56,58,59,60,61,64,65,67,68,69,70,73, %U A295389 74,76,77,78,82,83,85,86,87,89,91,92,94,95,96,98,100,101,102,104,105,106,109,110,111,113,114 %N A295389 Numbers whose sum of digits is squarefree. %C A295389 Numbers k such that A007953(k) is a term of A005117. - _Felix Fröhlich_, Nov 21 2017 %H A295389 Robert Israel, <a href="/A295389/b295389.txt">Table of n, a(n) for n = 1..10000</a> %p A295389 select(n -> numtheory:-issqrfree(convert(convert(n,base,10),`+`)), [$1..200]); # _Robert Israel_, Nov 21 2017 %o A295389 (PARI) is(n) = issquarefree(sumdigits(n)); %o A295389 for(n = 1, 200, if(is(n), print1(n,", "))) %Y A295389 Cf. A005117, A007953. Includes A028834. %K A295389 hear,nonn,base %O A295389 1,2 %A A295389 _Nile Nepenthe Wynar_, Nov 21 2017