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 A061765 #9 Aug 26 2022 05:25:46 %S A061765 1,4,5,8,12,20,9,24,14,30,20,40,24,36,36,32,30,56,30,96,33,50,36,120, %T A061765 32,96,54,72,72,90,33,80,68,84,68,112,60,120,72,180,96,132,60,160,168, %U A061765 90,68,160,80,128,90,150,84,216,90,216,102,180,120,288 %N A061765 a(n) = usigma(sigma(n)), where usigma(n) is the sum of unitary divisors of n (A034448) and sigma(n) is the sum of the divisors (A000203). %H A061765 Nathaniel Johnston, <a href="/A061765/b061765.txt">Table of n, a(n) for n = 1..10000</a> %F A061765 a(n) = A034448(A000203(n)). - _Amiram Eldar_, Aug 26 2022 %t A061765 a[n_] := Times @@ (1 + Power @@@ FactorInteger[DivisorSigma[1, n]]); a[1] = 1; Array[a, 100] (* _Amiram Eldar_, Aug 26 2022 *) %Y A061765 Cf. A000203, A034448. %K A061765 nonn %O A061765 1,2 %A A061765 _N. J. A. Sloane_, Oct 30 2001