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 A374221 #10 Jul 09 2024 19:33:52 %S A374221 3,4,5,12,15,20,21,24,33,35,36,39,40,44,45,48,51,52,55,57,60,65,68,69, %T A374221 75,76,80,85,87,92,93,95,96,100,105,108,111,115,116,120,123,124,129, %U A374221 132,135,141,145,147,148,155,156,159,160,164,165,168,172,177,180,183,185,188,189,192,195,196,201,204,205,212,213 %N A374221 Indices of 1's in A374200, where A374200 is the minimum value of A347381 that it obtains among unitary divisors of n larger than 1. %C A374221 It seems that for all odd terms x in this sequence, A374204(x) = 1, and they form a subsequence of all terms k for which A374204(k) = 1, that might be sequence A086748. %H A374221 Antti Karttunen, <a href="/A374221/b374221.txt">Table of n, a(n) for n = 1..20001</a> %o A374221 (PARI) isA374221 = A374220; %Y A374221 Cf. A000203, A005940, A347381, A374200, A374204, A374220 (characteristic function). %Y A374221 Cf. also A086748 and A347391 (very likely a subsequence). %K A374221 nonn %O A374221 1,1 %A A374221 _Antti Karttunen_, Jul 09 2024