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 A306667 #16 Sep 08 2022 08:46:21 %S A306667 1,6,32760,51001180160,54530444405217553992377326508106948362108928, %T A306667 133821156044600922812153118065015159487725568, %U A306667 42274041475824304453686528060845522019324411248640,48949643430560436794021629524876790263031553747866371344635527168 %N A306667 Numbers m such that lcm(tau(m), m) = sigma(m) where sigma(k) = the sum of the divisors of k (A000203) and tau(k) = the number of the divisors of k (A000005). %C A306667 Numbers m such that A009230(m) = A000203(m). %C A306667 Subsequence of multiply-perfect numbers (A007691). %H A306667 Giovanni Resta, <a href="/A306667/b306667.txt">Table of n, a(n) for n = 1..11</a> (from A007691 data) %e A306667 6 is a term because lcm(tau(6), 6) = lcm(4, 6) = 12 = sigma(6). %o A306667 (Magma) [n: n in [1..100000] | LCM(NumberOfDivisors(n), n) eq SumOfDivisors(n)] %Y A306667 Cf. A000005, A000203, A009230. %Y A306667 Cf. A069810 (gcd(k, sigma(k)) = tau(k)). %K A306667 nonn,hard %O A306667 1,2 %A A306667 _Jaroslav Krizek_, Mar 04 2019 %E A306667 a(4)-a(8) computed from A007691 data by _Giovanni Resta_, Mar 05 2019