A176925 Primes of the form 2^k + 41.

43, 73, 2089, 8233, 131113, 33554473, 137438953513, 140737488355369, 9007199254741033, 2658455991569831745807614120560689193

Offset: 1

Author

Vincenzo Librandi, Apr 29 2010

Keywords

• nonn

Comments

Generated by k = 1, 5, 11, 13, 17, 25, 37, 47, 53, 121, 445, 629, 839, 935, 1237, 3359, 3653, 4601,... - R. J. Mathar, Aug 24 2011

The next term has 134 digits. - Harvey P. Dale, Sep 24 2011

Programs

Magma

[ a: n in [0..750] | IsPrime(a) where a is 2^n+41 ];

Mathematica

Select[2^Range[0,500]+41,PrimeQ] (* Harvey P. Dale, Sep 24 2011 *)