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 A183021 #5 Mar 30 2012 18:39:49 %S A183021 5974080,12162100800,90079209000,555108915200 %N A183021 Smallest members of k-sociable cycles of order r, with k > 1 and r > 1. %C A183021 A k-sociable (or multisociable) cycle of order r consists of r distinct positive integers such that the sum of the aliquot divisors (or proper divisors) of each is equal to k times the next term in the cycle, where k (the multiplicity) is a fixed positive integer. %C A183021 a(1), a(2) and a(4) are the smallest terms of 2-sociable cycles of order 3 (or bicrowds), and a(3) is the smaller term of a 3-sociable cycle of order 2 (or triamicable pair). %C A183021 No other terms <= 10^12. %Y A183021 Cf. A001065, A166069, A183016, A183020, A183022. %K A183021 nonn,more %O A183021 1,1 %A A183021 _William Rex Marshall_, Jan 08 2011