A108280 Consider primes p and q such that p = 2^k + 27 and q = 2^(k+1) + 27 for some k; sequence gives values of p.

29, 43, 8219, 1099511627803, 10889035741470030830827987437816582766619

Offset

1,1

Links

Table of n, a(n) for n=1..5.

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", ") ) ) }

Crossrefs

Cf. A108293.

Sequence in context: A042973 A323628 A020997 * A374009 A248429 A077782

Adjacent sequences: A108277 A108278 A108279 * A108281 A108282 A108283

Keyword

nonn

Author

Cino Hilliard, Jun 29 2005

Status

approved