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 A189410 #12 Jun 16 2023 03:17:09 %S A189410 30,224,31248,3104896,1648898363392,9007070406180864, %T A189410 648516009881239552,74276402290253369241782714368, %U A189410 183899464903906662846152739755417029065034185182550163456,521712837267651850100441428388555336932039109444807734641004395552458397047586816 %N A189410 The least common multiple of a perfect number (A000396) and its arithmetic derivative (A003415). %C A189410 The greatest common divisor of a perfect number (A000396) and its arithmetic derivative (A003415) is an even superperfect number (A061652). %e A189410 A000396(2)=28, 28'= 32, lcm(28,32)=224 -> a(2)=224. %Y A189410 Cf. A000396, A003415, A061652. %K A189410 nonn %O A189410 1,1 %A A189410 _Giorgio Balzarotti_, Apr 21 2011