id:A100030 - OEIS Search Results

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Bisection of A008472.

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2, 2, 5, 2, 7, 5, 9, 2, 5, 7, 13, 5, 15, 9, 10, 2, 19, 5, 21, 7, 12, 13, 25, 5, 7, 15, 5, 9, 31, 10, 33, 2, 16, 19, 14, 5, 39, 21, 18, 7, 43, 12, 45, 13, 10, 25, 49, 5, 9, 7, 22, 15, 55, 5, 18, 9, 24, 31, 61, 10, 63, 33, 12, 2, 20, 16, 69, 19, 28, 14, 73, 5, 75, 39, 10, 21, 20, 18, 81, 7, 5 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`The sum of the distinct primes dividing 2n. - Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 11 2005`
	EXAMPLE	`a(6)=5 because 12=2^2*3 and 2+3=5.`
	MAPLE	`with(numtheory): a:=proc(n) local b: b:=convert(factorset(2*n), list): add(b[j], j=1..nops(b)) end: seq(a(n), n=1..90); (Deutsch)`
	CROSSREFS	`Sequence in context: A024931 A029648 A126103 this_sequence A029603 A025124 A030996` `Adjacent sequences: A100027 A100028 A100029 this_sequence A100031 A100032 A100033`
	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 20:09 EST 2009. Contains 167514 sequences.

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