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A362636
a(n) = Sum_{d|n, gcd(d,n/d)=1} d^d.
0
1, 5, 28, 257, 3126, 46688, 823544, 16777217, 387420490, 10000003130, 285311670612, 8916100448540, 302875106592254, 11112006826381564, 437893890380862528, 18446744073709551617, 827240261886336764178, 39346408075296924995918, 1978419655660313589123980, 104857600000000000000003382
OFFSET
1,2
FORMULA
a(p) = p^p + 1, for primes p.
CROSSREFS
Cf. A034444, A034448 (usigma).
Sequence in context: A377325 A362690 A116977 * A238981 A163694 A062796
KEYWORD
nonn,easy
AUTHOR
Wesley Ivan Hurt, Apr 28 2023
STATUS
approved