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Search: id:A057196
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| A057196 |
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Numbers n such that 2^n + 9 is prime. |
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+0
7
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| 1, 2, 3, 5, 6, 7, 9, 10, 18, 23, 30, 37, 47, 57, 66, 82, 95, 119, 175, 263, 295, 317, 319, 327, 670, 697, 886, 1342, 1717, 1855, 2394, 2710, 3229, 3253, 3749, 4375, 4494, 4557, 5278, 5567, 9327, 10129, 12727, 13615, 14893, 16473, 23639, 40053, 44399, 50335, 80949
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Some of the larger terms are only probable primes.
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MATHEMATICA
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Do[ If[ PrimeQ[ 2^n +9 ], Print[n]], { n, 1, 15000 }]
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CROSSREFS
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Cf. A104070 (primes of the form 2^n+3^2). [From Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Mar 14 2009]
Sequence in context: A158746 A062470 A018559 this_sequence A080637 A124134 A007071
Adjacent sequences: A057193 A057194 A057195 this_sequence A057197 A057198 A057199
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KEYWORD
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nonn
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Sep 15 2000
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EXTENSIONS
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More terms from Mike Oakes (mikeoakes2(AT)aol.com), Aug 17 2001
Edited by T. D. Noe (noe(AT)sspectra.com), Oct 30 2008
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