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A156973 Primes of the form 2^k + 17. 2
19, 8209, 2097169, 8589934609, 2417851639229258349412369, 680564733841876926926749214863536422929, 62165404551223330269422781018352605012557018849668464680057997111644937126566671941649 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

19 = 2^1 + 17 is in the sequence;

8209 = 2^13 + 17 is in the sequence.

MATHEMATICA

Delete[Union[Table[If[PrimeQ[2^n + 17], 2^n + 17, 0], {n, 1, 300}]], 1]

PROG

(MAGMA) [ a: n in [1..400] | IsPrime(a) where a is 2^n+17 ]; // Vincenzo Librandi, Nov 27 2010

CROSSREFS

Cf. A057733 (2^n+3), A123250 (2^n+5), A104066 (2^n+7), A156940 (2^n+11), A104067 (2^n+13).

Sequence in context: A067267 A124989 A265964 * A270972 A260005 A276739

Adjacent sequences:  A156970 A156971 A156972 * A156974 A156975 A156976

KEYWORD

nonn

AUTHOR

Edwin Dyke (ed.dyke(AT)btinternet.com), Feb 19 2009

EXTENSIONS

a(7) from Vincenzo Librandi, Apr 29 2010

STATUS

approved

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Last modified September 19 13:01 EDT 2020. Contains 337178 sequences. (Running on oeis4.)