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A108271 Consider primes p and q such that p = 2^k + 15 and q = 2^(k+1) + 15 for some k; sequence gives values of q. 1
19, 23, 31, 47, 79, 2063, 4111, 65551, 8388623 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..9.

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(y", ") ) ) }

(MAGMA) for k in [0..100] do p:=2^k+15; q:=2^(k+1)+15; if IsPrime(p) and IsPrime(q) then q; end if; end for;

CROSSREFS

Cf. A108266.

Sequence in context: A007639 A261311 A168144 * A245585 A060269 A245382

Adjacent sequences:  A108268 A108269 A108270 * A108272 A108273 A108274

KEYWORD

nonn

AUTHOR

Cino Hilliard, Jun 29 2005

STATUS

approved

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Last modified February 22 15:34 EST 2020. Contains 332137 sequences. (Running on oeis4.)