id:A100029 - OEIS Search Results

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Bisection of A008472.

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0, 3, 5, 7, 3, 11, 13, 8, 17, 19, 10, 23, 5, 3, 29, 31, 14, 12, 37, 16, 41, 43, 8, 47, 7, 20, 53, 16, 22, 59, 61, 10, 18, 67, 26, 71, 73, 8, 18, 79, 3, 83, 22, 32, 89, 20, 34, 24, 97, 14, 101, 103, 15, 107, 109, 40, 113, 28, 16, 24, 11, 44, 5, 127, 46, 131, 26, 8, 137, 139, 50, 24 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`The sum of the distinct primes dividing 2n-1. - Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 11 2005`
	EXAMPLE	`a(23)=8 because 45=3^2*5 and 3+5=8.`
	MAPLE	`with(numtheory): a:=proc(n) local b: b:=convert(factorset(2*n-1), list): add(b[j], j=1..nops(b)) end: seq(a(n), n=1..80); (Deutsch)`
	CROSSREFS	`Sequence in context: A120374 A088836 A076565 this_sequence A099984 A130141 A130142` `Adjacent sequences: A100026 A100027 A100028 this_sequence A100030 A100031 A100032`
	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 11 2005`

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Last modified November 25 08:46 EST 2009. Contains 167481 sequences.

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