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 A239877 #13 Sep 08 2022 08:46:07 %S A239877 1,2,6,14,23,93,95,343,1924,13358,27385,54709,150554,445242,581211, %T A239877 589819,14733535,18859421,19861702,371619757,775908129,1076759948, %U A239877 1083679128,7402437933,42679464436 %N A239877 Numbers k that divide A239876(k). %C A239877 Values of k for which A239876(k) / k is an integer. %C A239877 A239876 = partial sums of A229110 where A229110(n) = antisigma(n) mod n = A024816(n) mod n. %C A239877 a(26) > 3*10^11. - _Giovanni Resta_, Mar 29 2014 %e A239877 a(4) = 14 is in the sequence because A239876(14) / 14 = 70 / 14 = 5 is an integer. %o A239877 (Magma) [n: n in [1..1000] | u eq 0 where u is ((&+[(k*(k+1)div 2 - SumOfDivisors (k)) mod k: k in [1..n]]) mod n)] %Y A239877 Cf. A024816, A229110, A239876. %K A239877 nonn %O A239877 1,2 %A A239877 _Jaroslav Krizek_, Mar 29 2014 %E A239877 a(13)-a(25) from _Giovanni Resta_, Mar 29 2014