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A085961 Sigma of the least numbers k for which sigma is divisible by k (where sigma is the sum of the divisors of k, A000203(k)). 2

%I #7 Jan 07 2020 09:07:26

%S 1,4,3,4,15,6,7,8,18,20,44,12,13,28,15,32,68,18,38,20,42,44,138,24,

%T 150,78,54,28,174,60,31,32,132,68,140,36,74,38,39,40,164,42,258,44,90,

%U 138,282,48,98,150,102,104,212,54,110,56,57,174,354,60,183,124,63,128,195

%N Sigma of the least numbers k for which sigma is divisible by k (where sigma is the sum of the divisors of k, A000203(k)).

%H Amiram Eldar, <a href="/A085961/b085961.txt">Table of n, a(n) for n = 1..10000</a>

%F a(n) = A000203(A070982(n)).

%Y Cf. A070982, A000203, A066678.

%K nonn

%O 1,2

%A Yuval Dekel (dekelyuval(AT)hotmail.com), Aug 17 2003

%E More terms from _John W. Layman_, Aug 19 2003

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Last modified April 23 02:53 EDT 2024. Contains 371906 sequences. (Running on oeis4.)