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 A374138 #11 Jul 07 2024 13:42:01
%S A374138 8,28,496,8128,627013,3713337,33550336,64488069,3919528877
%N A374138 Numbers k that have more than two prime factors (with multiplicity) and A075255(k) is a multiple of A374127(k).
%H A374138 <a href="/index/O#opnseqs">Index entries for sequences where odd perfect numbers must occur, if they exist at all</a>
%F A374138 {k | A001222(k) > 2 and gcd(A075255(k), A374127(k)) = abs(A374127(k))}.
%o A374138 (PARI)
%o A374138 A001414(n) = ((n=factor(n))[, 1]~*n[, 2]);
%o A374138 A374128(n) = { my(s=A001414(n), x=n-s, u=(sigma(n)-s)-n); (gcd(x, u)==abs(u)); };
%o A374138 isA374138(n) = ((bigomega(n) > 2) && A374128(n));
%Y A374138 Intersection of A033942 and A374129.
%Y A374138 Cf. A000203, A001222, A001414, A075255, A374127.
%Y A374138 Cf. A000396 (after its initial 6, is a subsequence).
%K A374138 nonn,hard,more
%O A374138 1,1
%A A374138 _Antti Karttunen_, Jul 06 2024