id:A114001 - OEIS Search Results

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A sequence related the number of divisors of 2n-1.

+0
2

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; listen)

	OFFSET	`1,2`
	COMMENT	`Rows of A114000 expressed as decimals.`
	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: A083366 A006722 A039774 this_sequence A004044 A082711 A013622` `Adjacent sequences: A113998 A113999 A114000 this_sequence A114002 A114003 A114004`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Nov 12 2005`

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Last modified November 18 20:14 EST 2008. Contains 147244 sequences.

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