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 A303900 #9 May 05 2018 06:28:29 %S A303900 2,8,12,16,67,924122,1067239 %N A303900 Numbers k such that the average of all strong divisors of all positive integers <= k is an integer. %C A303900 We say d is a strong divisor of k iff d is a divisor of k and d > 1. %C A303900 Numbers k such that A002541(k) | A024917(k). %C A303900 a(8) > 10^12. - _Giovanni Resta_, May 05 2018 %H A303900 <a href="/index/Di#divisors">Index entries for sequences related to divisors of numbers</a> %Y A303900 Cf. A024917, A027750, A032741, A039653, A056550, A226647, A284288, A284755, A303480, A303482, A303659. %K A303900 nonn,more %O A303900 1,1 %A A303900 _Ilya Gutkovskiy_, May 02 2018 %E A303900 a(3)-a(7) corrected by _Daniel Suteu_, May 03 2018