id:A100005 - OEIS Search Results

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Bisection of A001414.

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0, 3, 5, 7, 6, 11, 13, 8, 17, 19, 10, 23, 10, 9, 29, 31, 14, 12, 37, 16, 41, 43, 11, 47, 14, 20, 53, 16, 22, 59, 61, 13, 18, 67, 26, 71, 73, 13, 18, 79, 12, 83, 22, 32, 89, 20, 34, 24, 97, 17, 101, 103, 15, 107, 109, 40, 113, 28, 19, 24, 22, 44, 15, 127, 46, 131, 26, 14, 137 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Integer log of (2n-1): sum of primes dividing 2n-1 (with repetition). - Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 10 2005`
	EXAMPLE	`a(23)=11 because 45=3^25^1 and 23+1*5=11.`
	MAPLE	`with(numtheory): a:=proc(n) local b: b:=op(2, ifactors(n)): sum(b[j][1]b[j][2], j=1..nops(b)): end: seq(a(2n-1), n=1..78); (Deutsch)`
	CROSSREFS	`Sequence in context: A151548 A071581 A084393 this_sequence A130159 A127314 A092257` `Adjacent sequences: A100002 A100003 A100004 this_sequence A100006 A100007 A100008`
	KEYWORD	`nonn,easy`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Nov 20 2004`
	EXTENSIONS	`More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 10 2005`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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