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 A348343 #5 Oct 14 2021 21:51:15
%S A348343 336,1792,5376,6096,21504,32004,97536,34062336,64512000,118008576,
%T A348343 30064771072
%N A348343 Smaller member of a noninfinitary amicable pair: numbers (k, m) such that nisigma(k) = m and nisigma(m) = k, where nisigma(k) is the sum of the noninfinitary divisors of k (A348271).
%C A348343 The larger counterparts are in A348344.
%e A348343 336 is a term since A348271(336) = 448 and A348271(448) = 336.
%t A348343 f[p_, e_] := Module[{b = IntegerDigits[e, 2], m}, m = Length[b]; Product[If[b[[j]] > 0, 1 + p^(2^(m - j)), 1], {j, 1, m}]]; isigma[1] = 1; isigma[n_] := Times @@ f @@@ FactorInteger[n]; s[n_] := DivisorSigma[1,n] - isigma[n]; seq={}; Do[m=s[n]; If[m>n && s[m]==n, AppendTo[seq, n]], {n,1,10^4}]; seq
%Y A348343 Cf. A327633, A348271, A348344.
%Y A348343 Similar sequences: A002025, A002952, A126165, A126169, A259038, A292980, A322541, A324708.
%K A348343 nonn,more
%O A348343 1,1
%A A348343 _Amiram Eldar_, Oct 13 2021