A138883 Number of digits in n-th even superperfect number A061652(n).

1, 1, 2, 2, 4, 5, 6, 10, 19, 27, 32, 38, 157, 183, 385, 663, 687, 969, 1280, 1332, 2917, 2993, 3376, 6002, 6533, 6987, 13395, 25962, 33265, 39751, 65050, 227831, 258715, 378632, 420921, 895932, 909525, 2098960

Offset: 1

Author

Omar E. Pol, Apr 08 2008

Keywords

• base
• nonn

Comments

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

Crossrefs

Cf. A019279, A028335, A061193, A061652.

Formula

a(n)=A055642(A061652(n)). - R. J. Mathar, May 22 2008

Extensions

More terms from R. J. Mathar, May 22 2008