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 A340110 #8 Dec 29 2020 02:53:44 %S A340110 10584000,12700800,15876000,19051200,21168000,22226400,25401600, %T A340110 29635200,31752000,37044000,38102400,42336000,44452800,47628000, %U A340110 50803200,52920000,55566000,57153600,59270400,63504000,64033200,66679200,74088000,76204800,79380000,84672000 %N A340110 Coreful 4-abundant numbers: numbers k such that csigma(k) > 4*k, where csigma(k) is the sum of the coreful divisors of k (A057723). %C A340110 A coreful divisor d of a number k is a divisor with the same set of distinct prime factors as k, or rad(d) = rad(k), where rad(k) is the largest squarefree divisor of k (A007947). %C A340110 Analogous to A068404 as A308053 is analogous to A005101. %H A340110 Amiram Eldar, <a href="/A340110/b340110.txt">Table of n, a(n) for n = 1..10000</a> %e A340110 10584000 is a term since csigma(10584000) = 42653520 > 4 * 10584000. %t A340110 f[p_, e_] := (p^(e + 1) - 1)/(p - 1) - 1; s[1] = 1; s[n_] := Times @@ (f @@@ FactorInteger[n]); Select[Range[10^8], s[#] > 4*# &] %Y A340110 Subsequence of A308053 and A340109. %Y A340110 Cf. A007947, A057723. %Y A340110 Similar sequences: A068404, A307114. %K A340110 nonn %O A340110 1,1 %A A340110 _Amiram Eldar_, Dec 28 2020