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A303008 Even pseudoprimes m (A006935) such that 2m+1 is prime. 2
2, 126217792286, 600030498926, 1248599869826, 226537279412126, 7615111129051346, 9609149773927166, 17502271515299726, 20140666152370226, 126921319513852046, 133564589570047406, 141572739574418846, 185615640867777506, 193420934175277166 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

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

LINKS

Table of n, a(n) for n=1..14.

CROSSREFS

Subsequence of A006935.

Cf. A300193, A303009, A303447, A303448.

Sequence in context: A154423 A072293 A158343 * A139180 A072947 A077303

Adjacent sequences:  A303005 A303006 A303007 * A303009 A303010 A303011

KEYWORD

nonn,hard

AUTHOR

Max Alekseyev, Apr 17 2018

STATUS

approved

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Last modified April 4 08:58 EDT 2020. Contains 333213 sequences. (Running on oeis4.)