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A129613 a(n) is the smallest natural number m such that 2^(2^k) + m is prime for k=0,1,...,n. 10
1, 1, 1, 1, 1, 15, 66747, 475425, 12124167, 14899339905, 8073774344085 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,6

COMMENTS

The first five terms of this sequence correspond to known Fermat primes.

LINKS

Table of n, a(n) for n=0..10.

CROSSREFS

Cf. A090872, A090874, A090875, A129614, A129615.

Sequence in context: A013756 A078185 A096224 * A248734 A259210 A013802

Adjacent sequences:  A129610 A129611 A129612 * A129614 A129615 A129616

KEYWORD

nonn

AUTHOR

Farideh Firoozbakht, May 13 2007, May 16 2007

EXTENSIONS

a(10) from Jens Kruse Andersen, Jun 05 2010

STATUS

approved

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Last modified February 20 13:33 EST 2019. Contains 320327 sequences. (Running on oeis4.)