1,1

Terms 21739 and 24029 were found by Lelio R. Paula in February and April 2009. Term 38299 was found by Jean-Louis Charton in October 2010 corresponding to a probable prime with 34587 digits.

a(17) > 10^5. - Robert Price, Dec 29 2012

Table of n, a(n) for n=1..16.

Top probable primes of form (8^n+7^n)/15

(PARI) is(n)=isprime((8^n+7^n)/15) \\ Charles R Greathouse IV, Feb 17 2017

See also A062574.

Sequence in context: A085104 A162652 A306889 * A031158 A301683 A091431

Adjacent sequences: A181138 A181139 A181140 * A181142 A181143 A181144

hard,nonn

Jean-Louis Charton, Oct 06 2010

approved