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A084406
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Numbers n such that n#*2^n-1 is prime, where n# = product of primes <= n.
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0
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2, 3, 7, 8, 14, 16, 18, 20, 40, 42, 44, 53, 134, 154, 185, 187, 191, 197, 200, 201, 230, 235, 239, 244, 256, 282, 303, 358, 489, 536, 665, 684, 719, 1098, 1204, 1400, 1516, 1629, 1903, 1997, 1999, 2104, 2477, 3075, 3676, 3785, 4115, 5429, 5808, 6069, 6276
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| The values 1098 through 1516 have been proved to be prime.
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LINKS
| The OpenPFGW Project, Primality Tester.
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MATHEMATICA
| p = 1; Do[If[PrimeQ[n], p *= n]; If[PrimeQ[p*2^n - 1], Print[n]], {n, 2, 10000}] (Propper)
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CROSSREFS
| Cf. A034386.
Sequence in context: A105601 A199971 A033082 * A075648 A071527 A097095
Adjacent sequences: A084403 A084404 A084405 * A084407 A084408 A084409
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KEYWORD
| nonn
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AUTHOR
| Jason Earls (zevi_35711(AT)yahoo.com), Jun 24 2003
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EXTENSIONS
| More terms from Ryan Propper (rpropper(AT)stanford.edu), Sep 05 2005
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