A138827 - OEIS

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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

(list; graph; refs; listen; history; text; internal format)

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.