|
%I #13 Feb 11 2020 03:54:15
%S 1,3,4,7,6,8,15,13,28,14,39,20,36,40,30,63,91,38,44,78,57,93,62,127,
%T 68,195,74,121,112,171,217,102,162,110,133,255,176,160,204,138,222,
%U 266,150,300,158,363,164,183,260,174,508,194,198,200,465,306,212,256,330
%N Sigma(k) of numbers k such that value of sigma(k) is unique; sigma(k) = A000203(k) = sum of divisors of k.
%H Amiram Eldar, <a href="/A211657/b211657.txt">Table of n, a(n) for n = 1..10000</a>
%F a(n) = sigma(A211656(n)).
%e For n = 4, a(n) = 7 because A211656(4) = 4; sigma (4) = 7.
%Y Cf. A000203, A066076, A211656, A211658, A211659, A211660, A206036.
%Y Cf. A007370 (sorted version of this sequence).
%K nonn
%O 1,2
%A _Jaroslav Krizek_, Apr 20 2012
|
