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A290200
Prime numbers of the form 4^k + 1.
8
2, 5, 17, 257, 65537
OFFSET
1,1
COMMENTS
Similar to Fermat primes, A019434, a(n) is of the form (2^2)^k + 1.
MATHEMATICA
Select[4^Range[0, 100] + 1, PrimeQ]
CROSSREFS
Sequence in context: A096848 A283107 A269834 * A132198 A269835 A111635
KEYWORD
nonn,more
AUTHOR
Robert Price, Jul 23 2017
STATUS
approved