A161496 Number of zeros in n-th even perfect number written in base 16.

0, 0, 1, 1, 3, 4, 4, 7, 15, 22, 26, 31, 130, 151, 319, 550, 570, 804, 1063, 1105, 2422, 2485, 2803, 4984, 5425, 5802, 11124, 21560, 27625, 33012, 54022, 189209, 214858, 314446, 349567, 744055, 755344, 1743148, 3366729, 5249002, 6009145, 6491237, 7600614, 8145664, 9289166

Offset: 1

Author

Juri-Stepan Gerasimov, Jun 11 2009

Keywords

• nonn
• base

Links

• Amiram Eldar, Table of n, a(n) for n = 1..48 (terms 1..47 from Ivan Panchenko)

Crossrefs

Cf. A000396, A135650, A160962, A161323.

Formula

a(n) = floor((A000043(n)-1)/4). - Gerson Washiski Barbosa, May 29 2011

Extensions

Definition changed (inserting the word "even"), a(31) corrected and a(41)-a(45) added by Ivan Panchenko, Aug 04 2018