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A157007
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Numbers n such that 2^n+3^3 is prime.
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1
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1, 2, 4, 5, 8, 10, 13, 14, 16, 40, 41, 44, 86, 110, 125, 133, 134, 145, 154, 184, 194, 301, 308, 320, 685, 1001, 1066, 1496, 1633, 2005, 2864, 3241
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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EXAMPLE
| For n = 1 2^1 + 27 = 29
For n = 2 2^2 + 27 = 31
For n = 4 2^4 + 27 = 43
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MATHEMATICA
| Delete[Union[Table[If[PrimeQ[2^n + 27], n, 0], {n, 1, 2000}]], 1]
Select[Range[5000], PrimeQ[2^#+27]&] (* From Harvey P. Dale, Mar 24 2011 *)
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CROSSREFS
| A019434 (2^(2^n)+1) A057733 (2^n+3) A123250 (2^n+5)
A104071 (Primes of the form 2^n+27)
Sequence in context: A188975 A115392 A179509 * A173509 A007729 A174868
Adjacent sequences: A157004 A157005 A157006 * A157008 A157009 A157010
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KEYWORD
| nonn
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AUTHOR
| Edwin Dyke (ed.dyke(AT)btinternet.com), Feb 20 2009
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EXTENSIONS
| More terms from Harvey P. Dale, Mar 24 2011.
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