|
%I #27 Jan 21 2021 10:45:54
%S 25908120,136616760,171430560,196876680,354049920,405601560,514374840,
%T 825473880,1204476000,2223650520,2510539920,3003191100,4017339480,
%U 4574146500,6129062940,6797728800,7311296520,9779952000,12472435080,13103164800,19989450000,22180840920,22710872520
%N Numbers k such that sigma(k) = 4 * sigma(k+1).
%H Seiichi Manyama, <a href="/A340582/b340582.txt">Table of n, a(n) for n = 1..30</a> (using A058073 data)
%Y Cf. A002961, A080372, A163193, A217791, A340713, A340720.
%K nonn
%O 1,1
%A _Seiichi Manyama_, Jan 21 2021
%E a(9)-a(23) from _Seiichi Manyama_ using A058073 data, Jan 21 2021
|
