OFFSET
0,1
COMMENTS
By Xylouris's version of Linnik's theorem, a(n) << 2^(5.2n). - Charles R Greathouse IV, Dec 28 2011
a(n) = prime(k) for some k < 5*n. - Pierre CAMI, Jul 20 2014
LINKS
Pierre CAMI, Table of n, a(n) for n = 0..10000 (first 2501 terms from T. D. Noe)
MATHEMATICA
f[n_] := Block[{k = 2}, While[ !PrimeQ[ Prime[k]*2^n - 1], k++ ]; Prime@k]; Table[f@n, {n, 0, 74}] (* Robert G. Wilson v, Feb 16 2007 *)
PROG
(PARI) a(n) = p=3; t=2^n; while(!isprime(p*t-1), p=nextprime(p+1)); p \\ Colin Barker, Jul 22 2014
CROSSREFS
KEYWORD
nonn
AUTHOR
Pierre CAMI, Feb 13 2007
EXTENSIONS
More terms from Robert G. Wilson v, Feb 16 2007
Entries checked and some errors corrected by N. J. A. Sloane, Mar 02 2007
STATUS
approved