A236752 Primes of the form k*2^(k-1) - 1.

3, 11, 31, 79, 191, 5119, 245759, 524287, 1114111, 3758096383, 1618481116086271, 653980173926178609468673073657929531391, 5359447279004780799548150067050349330431

Offset: 1

Author

Gerasimov Sergey, Jan 30 2014

Keywords

• nonn

Comments

Primes in A087323.

Corresponding values of k: 2, 3, 4, 5, 6, 10, 15, 16, 17, 28, 46, 123, ...

The values of k-1 are listed in A230769. - Jeppe Stig Nielsen, Oct 16 2019

Examples

			79 is in this sequence because it is prime and for k = 5, k*2^(k-1) - 1 = 5*2^(5-1) - 1 = 79.
		

Crossrefs

Cf. A002054, A003261, A196273, A230769.

Extensions

More terms and corrections of terms and comments by Ralf Stephan, Feb 03 2014