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A051438 a(n) = prime(2^n - 1). 8
2, 5, 17, 47, 127, 307, 709, 1613, 3659, 8147, 17851, 38867, 84011, 180497, 386083, 821603, 1742527, 3681113, 7754017, 16290041, 34136021, 71378551, 148948133, 310248233, 645155191, 1339484149, 2777105117, 5750079043, 11891268397, 24563311217, 50685770143 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Hugo Pfoertner, Table of n, a(n) for n = 1..57

FORMULA

a(n) = A181363(2^n - 1). - Reinhard Zumkeller, Oct 16 2010

a(n) = A000040(A000225(n)). - Michel Marcus, Nov 28 2017

MATHEMATICA

Prime[2^Range[34] - 1] (* Vladimir Joseph Stephan Orlovsky, Jul 19 2011 *)

PROG

(PARI) a(n)=prime(2^n-1) \\ Charles R Greathouse IV, Sep 28 2015

CROSSREFS

Cf. A000040, A000225, A033844, A018249, A051440, A051439.

Sequence in context: A275210 A219554 A074494 * A148401 A148402 A148403

Adjacent sequences:  A051435 A051436 A051437 * A051439 A051440 A051441

KEYWORD

nonn

AUTHOR

N. J. A. Sloane

EXTENSIONS

More terms from Michael Lugo (mlugo(AT)thelabelguy.com), Dec 22 1999

STATUS

approved

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Last modified July 11 20:03 EDT 2020. Contains 335652 sequences. (Running on oeis4.)