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 A166070 #11 Oct 02 2023 20:19:31
%S A166070 1,2,3,5,6,7,11,13,17,19,23,28,29,31,37,41,43,47,53,59,61,67,71,73,79,
%T A166070 83,89,97,101,103,107,109,113,120,127,131,137,139,149,151,157,163,167,
%U A166070 173,179,181,191,193,197,199,211,223,227,229,233,239,241,251,257,263
%N A166070 Sorted sequence of primes and multiply perfect numbers.
%C A166070 Numbers k such that sigma(k) is divisible by all proper divisors of k.
%H A166070 Harvey P. Dale, <a href="/A166070/b166070.txt">Table of n, a(n) for n = 1..1000</a>
%F A166070 A000040 Union A007691.
%F A166070 {1} Union A053813 Union A166069.
%F A166070 {1} Union A000040 Union A000396 Union A166069.
%e A166070 a(4) = 6: all proper divisors of 6 (1, 2, 3) divide sigma(6) = 12.
%t A166070 Select[Range[300],And@@Divisible[DivisorSigma[1,#],Most[Divisors[#]]]&] (* _Harvey P. Dale_, Jan 18 2015 *)
%Y A166070 Cf. A053813.
%K A166070 nonn
%O A166070 1,2
%A A166070 _Jaroslav Krizek_, Oct 06 2009, Oct 16 2009