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A096060
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(2^(p-1)-1)/(3*p) where p = prime(n).
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4
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1, 3, 31, 105, 1285, 4599, 60787, 3085465, 11545611, 619094385, 8939118925, 34093383807, 499069107643, 28324525958305, 1628420204246959, 6300117511512825, 367099384551433863, 5542683665339959171
(list; graph; refs; listen; history; internal format)
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OFFSET
| 3,2
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LINKS
| T. D. Noe, Table of n, a(n) for n=3..100
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FORMULA
| a(n) = A007663(n)/3 for n>2. - Alexander Adamchuk (alex(AT)kolmogorov.com), Jun 08 2006
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MATHEMATICA
| Table[(2^(Prime[n]-1)-1)/(3*Prime[n]), {n, 3, 22}] - Alexander Adamchuk (alex(AT)kolmogorov.com), Jun 08 2006
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CROSSREFS
| Equals A001045(prime(n)-1)/prime(n).
Cf. A007663.
Sequence in context: A077547 A104312 A107197 * A199367 A119682 A069630
Adjacent sequences: A096057 A096058 A096059 * A096061 A096062 A096063
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KEYWORD
| nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jun 18 2004
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EXTENSIONS
| More terms from Alexander Adamchuk (alex(AT)kolmogorov.com), Jun 08 2006
Formula in cross-ref to A001045 corrected by Jonathan Sondow (jsondow(AT)alumni.princeton.edu), Jul 19 2010
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