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

Author

Omar E. Pol, Apr 01 2008

Keywords

• nonn
• base

Comments

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

Crossrefs

Cf. A007953, A061652.

Cf. A007605, A019279, A066538.

Formula

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

Extensions

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

More terms from Jinyuan Wang, Mar 15 2020