A138870 First 3 digits of n-th even superperfect number A061652(n).

2, 4, 16, 64, 409, 655, 262, 107, 115, 309, 811, 850, 343, 265, 520, 737, 223, 129, 953, 142, 239, 173, 140, 215, 224, 201, 427, 268, 260, 256, 373, 870, 647, 206, 407, 311, 637, 218, 462, 629, 149, 610, 157, 622, 101, 849, 158

Offset

1,1

Comments

Also, first 3 digits of n-th superperfect number A019279(n), if there are no odd superperfect numbers.

Links

Table of n, a(n) for n=1..47.

Crossrefs

Cf. A019279, A061652, A138864, A138867, A138871, A138872, A138876.

Sequence in context: A001900 A113247 A280132 * A153992 A153995 A153998

Adjacent sequences: A138867 A138868 A138869 * A138871 A138872 A138873

Keyword

nonn,base,more

Author

Omar E. Pol, Apr 02 2008

Extensions

a(12)-a(31) from R. J. Mathar, Feb 05 2010

a(32)-a(41) from Max Alekseyev, Feb 11 2012

a(42)-a(47) from Jinyuan Wang, Mar 14 2020

Status

approved