A195530 Primes of the form 3*2^n - 2*n - 1.

2, 3, 7, 17, 179, 751, 6121, 12263, 49123, 393181, 50331599, 201326539, 13194139533227, 56668397794435742564203, 1856910058928070412348686157, 8769009823985417509222108996297698117935595257533, 4597486622597666575075041081450927550856217366550806167

Offset: 1

Author

Juri-Stepan Gerasimov, Sep 21 2011

Keywords

• nonn

Comments

Generated by n = 0, 1, 2, 3, 6, 8, 11, 12, 14, 17, 24, 42, 74, 89, 161, 180,...

Crossrefs

Cf. A005408, A007505, A007283.

Programs

Mathematica

Select[Table[3 2^n-2n-1,{n,0,200}],PrimeQ] (* Harvey P. Dale, May 24 2012 *)

Formula

prime: A007283(n)-A005408(n).