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A161514 Number of digits in n-th even perfect number written in base 8. 2
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

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.

Sequence in context: A067139 A014657 A171056 * A215779 A140329 A163292

Adjacent sequences:  A161511 A161512 A161513 * A161515 A161516 A161517

KEYWORD

nonn,base

AUTHOR

Juri-Stepan Gerasimov, Jun 12 2009

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

STATUS

approved

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Last modified January 19 06:37 EST 2020. Contains 331033 sequences. (Running on oeis4.)