A138827 Sum of digits of n-th even superperfect number A061652(n).

2, 4, 7, 10, 19, 25, 19, 37, 82, 115, 142, 172, 745, 856, 1603, 2980, 3079, 4240, 5812, 5842, 13165, 13480, 15136, 27052, 29455, 31339, 60112, 116386, 149239, 179821, 291511, 1025683, 1164760, 1703224, 1891861, 4038604, 4091767, 9440575, 18241120, 28450837, 32576617

Offset

1,1

Comments

Also, sum of digits of n-th superperfect number A019279(n), if there are no odd superperfect numbers.

Links

Table of n, a(n) for n=1..41.

Formula

a(n) = A007953(A061652(n)). - Michel Marcus, Mar 15 2020

Crossrefs

Cf. A007953, A061652.

Cf. A007605, A019279, A066538.

Sequence in context: A343328 A088762 A217385 * A353055 A173730 A036685

Adjacent sequences: A138824 A138825 A138826 * A138828 A138829 A138830

Keyword

nonn,base

Author

Omar E. Pol, Apr 01 2008

Extensions

a(10)-a(33) from R. J. Mathar, May 22 2008

More terms from Jinyuan Wang, Mar 15 2020

Status

approved