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A128458
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Numbers n such that 15^n - 2 is a prime.
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12
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1, 2, 3, 7, 12, 17, 19, 51, 65, 550, 1460, 1641, 7035
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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MATHEMATICA
| Do[ f = 15^n - 2; If[ PrimeQ[ f ], Print[ {n, f} ] ], {n, 1, 1000} ]
Do[If[PrimeQ[15^n - 2], Print[n]], {n, 10^4}] -Ryan Propper (rpropper(AT)stanford.edu), Jun 06 2007
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CROSSREFS
| Cf. A084714 = smallest prime of the form (2n-1)^k - 2, or 0 if no such number exists. Cf. A128472 = smallest prime of the form (2n-1)^k - 2 for k>(2n-1), or 0 if no such number exists. Cf. A014224, A109080, A090669, A128455, A128457, A128459, A128460, A128461.
Sequence in context: A168249 A080140 A019568 * A066733 A049623 A061577
Adjacent sequences: A128455 A128456 A128457 * A128459 A128460 A128461
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KEYWORD
| hard,more,nonn
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AUTHOR
| Alexander Adamchuk (alex(AT)kolmogorov.com), Mar 14 2007
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EXTENSIONS
| 550 from Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), May 05 2007
3 more terms from Ryan Propper (rpropper(AT)stanford.edu), Jun 06 2007
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