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Search: id:A051783
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| A051783 |
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Numbers n such that 3^n + 2 is prime. |
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+0
18
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| 0, 1, 2, 3, 4, 8, 10, 14, 15, 24, 26, 36, 63, 98, 110, 123, 126, 139, 235, 243, 315, 363, 386, 391, 494, 1131, 1220, 1503, 1858, 4346, 6958, 7203, 10988, 22316, 33508, 43791, 45535, 61840, 95504
(list; graph; listen)
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OFFSET
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1,3
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LINKS
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Henri & Renaud Lifchitz, PRP Records.
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EXAMPLE
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3^8+2 = 6563 is prime, so 8 is in the sequence.
3^26 + 2 = 2541865828331, a prime number
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MATHEMATICA
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Select[Range[0, 20000], PrimeQ[3^# + 2] &]
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CROSSREFS
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Cf. A057735.
Cf. A087885 = numbers n such that 5^n + 2 is a prime.
Sequence in context: A121612 A061193 A135772 this_sequence A033083 A005542 A037171
Adjacent sequences: A051780 A051781 A051782 this_sequence A051784 A051785 A051786
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KEYWORD
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nonn
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AUTHOR
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Jud McCranie (j.mccranie(AT)comcast.net), Dec 09 1999
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EXTENSIONS
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More terms from Dave Rusin (rusin(AT)math.niu.edu), Sep 29 2000
a(32) from Ray Chandler (rayjchandler(AT)sbcglobal.net), Nov 21 2004
{22316, 33508, 43791, 45535, 61840} found by Henry Lifchitz during 2002 through 2004; 95504 found by Wojciech Florek Dec 15 2005. - Alexander Adamchuk (alex(AT)kolmogorov.com), Mar 02 2008
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