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A098028
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Smallest prime p such that p-2 is a product of exactly n distinct primes.
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1
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5, 17, 107, 1367, 15017, 285287, 6561557, 179444267, 3234846617, 100280245067, 3710369067407, 196649560572467, 8309321386330967, 307444891294245707, 24615215445537161447, 961380175077106319537, 78523577350789412776937
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| 1367 is the 4-th entry in the sequence because it is followed by primes 1997, 2417, 3137, 3257, ... with the property 1367-2 = 3*5*7*13, 1997-2 = 3*5*7*19, 2417-2 = 3*5*7*23, 3137-2 = 3*5*11*19, 3257-2 = 3*5*7*31, ...
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MATHEMATICA
| Do[s = 3; While[ ! (Length[FactorInteger[Prime[s] - 2]] == n && Max[Last /@ FactorInteger[Prime[s] - 2]] == 1), s++ ]; Print[Prime[s]], {n, 1, 8}] (Propper)
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CROSSREFS
| Sequence in context: A034821 A158007 A143562 * A100301 A096178 A084167
Adjacent sequences: A098025 A098026 A098027 * A098029 A098030 A098031
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KEYWORD
| nonn
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AUTHOR
| Lekraj Beedassy (blekraj(AT)yahoo.com), Sep 10 2004
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EXTENSIONS
| Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Sep 18 2004
One more term from Ryan Propper (rpropper(AT)stanford.edu), Sep 01 2005
More terms from Don Reble (djr(AT)nk.ca), Apr 03 2006
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