

A295111


Primes p such that 2^p  p is also a prime.


0




OFFSET

1,1


COMMENTS

a(6) > 1061095.
Intersection of A000040 and A048744.
Since numbers other than 3 that are congruent to 3 mod 6 are composite, for n > 2, a(n) is congruent to 1 mod 6 (see comments by Iain Fox in A048744).


LINKS

Table of n, a(n) for n=1..5.


EXAMPLE

p=13, 2^13  13 = 8179 is prime.


PROG

(PARI) lista(nn) = forprime(p=2, nn, if(ispseudoprime(2^p  p), print1(p, ", ")))


CROSSREFS

Cf. A000325, A081296, A048744, A057663, A057673.
Sequence in context: A234366 A084958 A249573 * A229117 A295722 A037392
Adjacent sequences: A295108 A295109 A295110 * A295112 A295113 A295114


KEYWORD

hard,more,nonn


AUTHOR

Iain Fox, Nov 14 2017


STATUS

approved



