A161496 - OEIS

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

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OFFSET

1,5

LINKS

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

FORMULA

a(n) = floor((A000043(n)-1)/4) if there are no odd perfect numbers. - Gerson Washiski Barbosa, May 29 2011

CROSSREFS

Cf. A000396, A135650, A160962, A161323.

Sequence in context: A225738 A186679 A275742 * A010612 A021033 A269714

Adjacent sequences: A161493 A161494 A161495 * A161497 A161498 A161499

KEYWORD

nonn,base

AUTHOR

Juri-Stepan Gerasimov, Jun 11 2009

EXTENSIONS

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

STATUS

approved