

A128472


a(n) is the smallest prime of the form (2n1)^k  2 for k > (2n1), or 0 if no such number exists.


13




OFFSET

1,2


COMMENTS

a(6) = 11^22420  2 was found by Rick L. Shepherd on Sep 29 2007. It has 23349 decimal digits and it is too large to include.
a(7) through a(12): {771936328432730777189183517369830159827426282764863750131729657829597399846468418688727, 98526125335693359373, 339448671314611904643504117119, 37589973457545958193355599, 1136272165922724266740722458520499, 480250763996501976790165756943039}.


LINKS



CROSSREFS

Cf. A084714 (smallest prime of the form (2n1)^k  2).
Cf. A133856 (least number k > (2n1) such that (2n1)^k  2 is prime).


KEYWORD

nonn


AUTHOR



EXTENSIONS



STATUS

approved



