A113936 a(n) = k-th prime, where k = n-th Mersenne prime = A000668(n).

5, 17, 127, 709, 84011, 1742527, 7754017, 50685770143

Offset

1,1

Links

Table of n, a(n) for n=1..8.

Formula

a(n) = A000040(A000668(n)). [From Omar E. Pol, Dec 09 2009]

Mathematica

Prime[2^{2, 3, 5, 7, 13, 17, 19, 31} - 1] (* Robert G. Wilson v *)

Prog

(PARI) prime(2^13-1) prime(2^7-1) prime(2^5-1) prime(2^3-1) prime(2^2-1)

Crossrefs

Cf. A000043, A000668.

Sequence in context: A202038 A012259 A256459 * A365295 A012263 A076448

Adjacent sequences: A113933 A113934 A113935 * A113937 A113938 A113939

Keyword

hard,nonn

Author

Jorge Coveiro, Jan 31 2006

Extensions

a(6)-a(8) from Robert G. Wilson v and Stefan Steinerberger, Jan 31 2006

A-number in definition corrected by Omar E. Pol, Dec 09 2009

Status

approved