A303008 Even pseudoprimes m (A006935) such that 2m+1 is prime.

2, 126217792286, 600030498926, 1248599869826, 226537279412126, 7615111129051346, 9609149773927166, 17502271515299726, 20140666152370226, 126921319513852046, 133564589570047406, 141572739574418846, 185615640867777506, 193420934175277166

Offset: 1

Author

Max Alekseyev, Apr 17 2018

Keywords

• nonn
• hard

Comments

For n>1, 2*a(n)+1 belongs to A300193.

Crossrefs

Subsequence of A006935.

Cf. A300193, A303009, A303447, A303448.