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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; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| The sum of the distinct primes dividing 2n-1. - Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 11 2005
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EXAMPLE
| a(23)=8 because 45=3^2*5 and 3+5=8.
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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)
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CROSSREFS
| Sequence in context: A088836 A076565 A199423 * A099984 A130141 A130142
Adjacent sequences: A100026 A100027 A100028 * A100030 A100031 A100032
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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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