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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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified September 25 01:17 EDT 2018. Contains 315360 sequences. (Running on oeis4.)