A138871 Last 3 digits of n-th even superperfect number A061652(n).

2, 4, 16, 64, 96, 536, 144, 824, 976, 56, 64, 864, 576, 64, 544, 504, 176, 536, 496, 304, 56, 776, 96, 736, 376, 256, 336, 104, 504, 656, 224, 944, 296, 264, 856, 576, 136, 896, 536, 24, 704, 624, 936, 936, 464, 376, 256, 976

Offset: 1

Author

Omar E. Pol, Apr 02 2008

Keywords

• nonn
• base
• more

Comments

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

Crossrefs

Cf. A019279, A061652, A138865, A138867, A138870, A138872.

Formula

a(n) = 2^(A000043(n)-1) mod 1000. - Max Alekseyev, Feb 16 2024

Extensions

More terms from R. J. Mathar, Feb 05 2010

a(40)-a(41) from Max Alekseyev, Feb 11 2012

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

a(48) from Max Alekseyev, Feb 16 2024