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%I #10 Mar 01 2024 06:09:50
%S 1,17,7625597484988
%N a(n) = sigma_(n^n)(n).
%H Amiram Eldar, <a href="/A157255/b157255.txt">Table of n, a(n) for n = 1..4</a>
%t Table[DivisorSigma[n^n,n],{n,1,5}]
%o (PARI) a(n) = sigma(n, n^n); \\ _Amiram Eldar_, Mar 01 2024
%Y Cf. A000312, A023887.
%K bref,nonn
%O 1,2
%A _Vladimir Joseph Stephan Orlovsky_, Feb 26 2009
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