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 A342838 #22 May 10 2021 09:24:26 %S A342838 21,31,32,39,42,62,67,75,82,91,93,97,104,109,121,127,135,137,139,140, %T A342838 145,146 %N A342838 Indices m such that A342834(m) is not squarefree. %C A342838 From the factorization of the initial terms of A342834, it may appear that A342834(n) is always squarefree, but this is false, and that present sequence lists the exceptions. %o A342838 (PARI) f(n) = my(s=""); for (k=1, n, s = Str(s, precprime(10^k))); eval(s); \\ A342834 %o A342838 isok(m) = !issquarefree(f(m)); \\ _Michel Marcus_, Apr 01 2021 %Y A342838 Cf. A013929, A342834, A342835, A342836, A342837. %K A342838 nonn,base,more %O A342838 1,1 %A A342838 _Bernard Schott_ and _Daniel Suteu_, Apr 01 2021