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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; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| The sum of the distinct primes dividing 2n. - Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 11 2005
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EXAMPLE
| a(6)=5 because 12=2^2*3 and 2+3=5.
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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)
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CROSSREFS
| Sequence in context: A024931 A029648 A126103 * A029603 A204202 A025124
Adjacent sequences: A100027 A100028 A100029 * A100031 A100032 A100033
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Nov 20 2004
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EXTENSIONS
| More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 11 2005
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