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A156973
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Primes of the form 2^k + 17.
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2
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19, 8209, 2097169, 8589934609, 2417851639229258349412369, 680564733841876926926749214863536422929, 62165404551223330269422781018352605012557018849668464680057997111644937126566671941649
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OFFSET
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1,1
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LINKS
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Table of n, a(n) for n=1..7.
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EXAMPLE
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19 = 2^1 + 17 is in the sequence;
8209 = 2^13 + 17 is in the sequence.
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MATHEMATICA
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Delete[Union[Table[If[PrimeQ[2^n + 17], 2^n + 17, 0], {n, 1, 300}]], 1]
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PROG
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(MAGMA) [ a: n in [1..400] | IsPrime(a) where a is 2^n+17 ]; // Vincenzo Librandi, Nov 27 2010
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CROSSREFS
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Cf. A057733 (2^n+3), A123250 (2^n+5), A104066 (2^n+7), A156940 (2^n+11), A104067 (2^n+13).
Sequence in context: A340165 A124989 A265964 * A270972 A260005 A276739
Adjacent sequences: A156970 A156971 A156972 * A156974 A156975 A156976
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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 19 2009
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EXTENSIONS
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a(7) from Vincenzo Librandi, Apr 29 2010
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STATUS
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approved
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