A236752 - OEIS

%I #28 Oct 16 2019 05:50:13

%S 3,11,31,79,191,5119,245759,524287,1114111,3758096383,

%T 1618481116086271,653980173926178609468673073657929531391,

%U 5359447279004780799548150067050349330431

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

%C Primes in A087323.

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

%C The values of k-1 are listed in A230769. - _Jeppe Stig Nielsen_, Oct 16 2019

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

%Y Cf. A002054, A003261, A196273, A230769.

%K nonn

%O 1,1

%A _Gerasimov Sergey_, Jan 30 2014

%E More terms and corrections of terms and comments by _Ralf Stephan_, Feb 03 2014