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.

19, 23, 31, 47, 79, 2063, 4111, 65551, 8388623

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 * A351121 A245585 A343741

Adjacent sequences: A108268 A108269 A108270 * A108272 A108273 A108274

Keyword

nonn

Author

Cino Hilliard, Jun 29 2005

Status

approved