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Search: id:A128460
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| A128460 |
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Numbers n such that 19^n - 2 is a prime. |
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+0
10
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| 1, 2, 3, 13, 14, 19, 20, 23, 38, 1124, 7592
(list; graph; listen)
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OFFSET
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1,2
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MATHEMATICA
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Do[ f = 19^n - 2; If[ PrimeQ[ f ], Print[ {n, f} ] ], {n, 1, 1000} ]
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CROSSREFS
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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, A128458, A128459, A128461.
Sequence in context: A117684 A056445 A100385 this_sequence A101541 A059670 A038975
Adjacent sequences: A128457 A128458 A128459 this_sequence A128461 A128462 A128463
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KEYWORD
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hard,more,nonn
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AUTHOR
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Alexander Adamchuk (alex(AT)kolmogorov.com), Mar 14 2007
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EXTENSIONS
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1124 from Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), May 05 2007
7592 from Ryan Propper (rpropper(AT)cs.stanford.edu), Dec 31 2007
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