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A156940 Primes of the form 2^k + 11. 5
13, 19, 43, 139, 523, 32779, 8388619, 536870923, 2147483659, 36028797018963979, 2361183241434822606859, 151115727451828646838283, 254629497041810760783555711051172270131433549208242031329517556169297662470417088272924683 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..13.

FORMULA

a(n) = 2^A102633(n) + 11. - R. J. Mathar, Feb 20 2009

MATHEMATICA

Delete[Union[Table[If[PrimeQ[2^n + 11], 2^n + 11, 0], {n, 1, 200}]], 1]

PROG

(MAGMA) [ a: n in [0..350] | IsPrime(a) where a is 2^n+11 ] // Vincenzo Librandi, Nov 26 2010

CROSSREFS

Cf. A057733, A123250, A104066.

Sequence in context: A098413 A174152 A103176 * A220162 A248483 A274424

Adjacent sequences:  A156937 A156938 A156939 * A156941 A156942 A156943

KEYWORD

nonn

AUTHOR

Edwin Dyke (ed.dyke(AT)btinternet.com), Feb 18 2009

EXTENSIONS

a(13) from Vincenzo Librandi, Apr 29 2010

STATUS

approved

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Last modified February 17 18:14 EST 2020. Contains 332005 sequences. (Running on oeis4.)