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A176030 a(n) = n^(sigma_2(n)). 0

%I #8 Sep 03 2022 22:24:28

%S 1,32,59049,4398046511104,1490116119384765625,

%T 808281277464764060643139600456536293376,

%U 1798465042647412146620280340569649349251249

%N a(n) = n^(sigma_2(n)).

%C sigma_2 = A001157 is the sum of squares of divisors of n.

%F a(n) = n^A001157(n).

%e a(1) = 1^1 = 1.

%e a(2) = 2^(1+4) = 32.

%e a(3) = 3^(1+9) = 59049.

%t Table[n^DivisorSigma[2,n], {n, 20}]

%Y Cf. A001157, A100879.

%K nonn,easy

%O 1,2

%A _Michel Lagneau_, Apr 06 2010

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Last modified March 29 05:48 EDT 2024. Contains 371265 sequences. (Running on oeis4.)