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 A348035 #13 Sep 29 2021 04:48:10 %S A348035 1,6,28,120,496,672,8128,523776,33550336,1379454720,8589869056, %T A348035 137438691328,2305843008139952128,203820700083634254643200, %U A348035 2658455991569831744654692615953842176 %N A348035 Multiply-perfect numbers k that have a unitary divisor d such that sigma(d)*d = k. %C A348035 At least the even terms of A000396 are all present, thus if there are an infinite number of Mersenne primes (A000668), then it implies that this sequence is infinite as well. %H A348035 <a href="/index/Si#SIGMAN">Index entries for sequences related to sigma(n)</a> %Y A348035 Subsequence of A348031. Intersection of A007691 and A348034. %Y A348035 Cf. A000396, A000668. %K A348035 nonn %O A348035 1,2 %A A348035 _Antti Karttunen_, Sep 26 2021