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Search: id:A156982
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| A156982 |
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Numbers n such that 2^n+29 is prime. |
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+0
1
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| 1, 3, 5, 7, 9, 13, 15, 17, 23, 27, 33, 37, 43, 63, 69, 73, 79, 89, 117, 127, 239, 395, 409, 465, 837, 2543
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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n can't be of the form 4m+2 or 4m because 2^(2m+2) + 29 is divisible by 3 and 2^4m + 29 is divisible by 15 [From Avik Roy (avik_3.1416(AT)yahoo.co.in), Feb 21 2009]
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EXAMPLE
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For n = 1 2^1 + 29 = 31
For n = 3 2^3 + 29 = 37
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MATHEMATICA
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Delete[Union[Table[If[PrimeQ[2^n + 29], n, 0], {n, 1, 2600}]], 1]
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CROSSREFS
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A019434 Fermat Primes 2^(2^n)+1 A057732 (2^n+3) A059242 (2^n+5) A057195 (2^n+7) A102633 (2^n+11)
Sequence in context: A063951 A003553 A003532 this_sequence A157048 A003543 A114513
Adjacent sequences: A156979 A156980 A156981 this_sequence A156983 A156984 A156985
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KEYWORD
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nonn
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AUTHOR
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Edwin Dyke (ed.dyke(AT)btinternet.com), Feb 20 2009
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