A050545 Numbers n such that 39*2^n-1 is a prime.

3, 24, 105, 153, 188, 605, 795, 813, 839, 2135, 2619, 4053, 8333, 15519, 16025, 16505, 30684, 40700, 43683, 52233, 142205, 222345, 225333, 292839, 322613, 747219, 781220

Offset: 1

Author

N. J. A. Sloane, Dec 29 1999

Keywords

• hard
• nonn

Links

• Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for k < 300
• Wilfrid Keller, List of primes k.2^n - 1 for k < 300
• Index entries for sequences of n such that k*2^n-1 (or k*2^n+1) is a prime
• Kosmaj, Riesel list k<300.

Crossrefs

Cf. A002269 = 39*2^n+1 is a prime.

Extensions

More terms from Hugo Pfoertner, Aug 29 2004

More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008