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A108259 Consider primes p and q such that p = 3^k + 2 and q = 3^(k+1) + 2 for some k; sequence gives values of p. 0
3, 5, 11, 29, 4782971 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..4.

EXAMPLE

3^1 + 2 = 5, 3^2 + 2 = 11.

MATHEMATICA

3^#+2&/@Select[Range[0, 20], AllTrue[{3^#+2, 3^(#+1)+2}, PrimeQ]&] (* The program uses the AllTrue function from Mathematica version 10 *) (* Harvey P. Dale, Nov 01 2015 *)

PROG

(PARI) g(m, n, b) = { for(x=0, n, y=m+b^x+b%2; z=m+b^(x+1)+b%2; if(isprime(y)&isprime(z), print1(p", ") ) ) }

CROSSREFS

Sequence in context: A146243 A262936 A214089 * A093933 A165572 A246901

Adjacent sequences:  A108256 A108257 A108258 * A108260 A108261 A108262

KEYWORD

nonn

AUTHOR

Cino Hilliard, Jun 29 2005

STATUS

approved

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Last modified August 9 17:04 EDT 2022. Contains 356026 sequences. (Running on oeis4.)