A161514 Number of digits in n-th even perfect number written in base 8.

1, 2, 3, 5, 9, 11, 13, 21, 41, 59, 71, 85, 347, 405, 853, 1469, 1521, 2145, 2835, 2949, 6459, 6627, 7475, 13291, 14467, 15473, 29665, 57495, 73669, 88033, 144061, 504559, 572955, 838525, 932179, 1984147, 2014251, 4648395, 8977945, 13997341, 16024389, 17309967, 20268305, 21721771, 24771111, 28429201, 28741739

Offset: 1

Author

Juri-Stepan Gerasimov, Jun 12 2009

Keywords

• nonn
• base

Comments

Or number of digits in A161323(n), assuming that all perfect numbers are even.

Links

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

Crossrefs

Cf. A000396, A161323.

Extensions

Definition changed (inserting the word "even"), a(12) and a(27) corrected and a(40)-a(45) added by Ivan Panchenko, Aug 06 2018