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A114001 A sequence related the number of divisors of 2n-1. 1
1, 3, 5, 9, 25, 33, 65, 225, 257, 513, 1665, 2049, 5121, 12801, 16385, 32769, 100353, 180225, 262145, 794625, 1048577, 2097153, 7634945, 8388609, 18874369, 50462721, 67108865, 171966465, 403177473, 536870913, 1073741825 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Rows of A114000 expressed as decimals.

LINKS

Table of n, a(n) for n=1..31.

EXAMPLE

a(5)=25 converts to 11001 in binary, which has sum of digits equal to 3.

9=2*5-1 has 3 divisors.

CROSSREFS

Cf. A099774.

Sequence in context: A006722 A251413 A039774 * A171879 A171877 A004044

Adjacent sequences:  A113998 A113999 A114000 * A114002 A114003 A114004

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Nov 12 2005

STATUS

approved

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Last modified February 18 20:32 EST 2018. Contains 299330 sequences. (Running on oeis4.)