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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. 12
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
CROSSREFS
Sequence in context: A013756 A078185 A096224 * A248734 A259210 A013802
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 May 17 17:07 EDT 2024. Contains 372603 sequences. (Running on oeis4.)