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

1,3

Comments

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

Links

Table of n, a(n) for n=1..38.

Formula

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

Crossrefs

Cf. A019279, A028335, A061193, A061652.

Sequence in context: A085140 A232166 A325555 * A257632 A325554 A367962

Adjacent sequences: A138880 A138881 A138882 * A138884 A138885 A138886

Keyword

base,nonn

Author

Omar E. Pol, Apr 08 2008

Extensions

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

Status

approved