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

1,1

Comments

Also, last 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..48.

Formula

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

Crossrefs

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

Sequence in context: A153966 A138867 A138868 * A001901 A127588 A187822

Adjacent sequences: A138868 A138869 A138870 * A138872 A138873 A138874

Keyword

nonn,base,more

Author

Omar E. Pol, Apr 02 2008

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

Status

approved