

A128944


Numbers n such that the smallest prime > 2^n is a twin prime member.


1



1, 2, 3, 4, 9, 10, 16, 23, 229, 245, 266, 338, 628, 4118
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OFFSET

1,2


LINKS

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


FORMULA

A014210(a(n)) = A128949(n).


EXAMPLE

For n=4, 17 is the smallest prime > 2^4 and is a member of the twin prime pair 17, 19.


PROG

(PARI) g(n, b)=for(x=1, n, y=nextprime(b^x); if(ispseudoprime(y+2), print1(x", ")))


CROSSREFS

Sequence in context: A098551 A249943 A251620 * A295969 A174437 A127150
Adjacent sequences: A128941 A128942 A128943 * A128945 A128946 A128947


KEYWORD

hard,more,nonn


AUTHOR

Cino Hilliard, Apr 28 2007


EXTENSIONS

Edited by Ray Chandler, May 12 2007
One more term from Ryan Propper, Jan 03 2008


STATUS

approved



