Smallest odd prime number Q such that Q*2^P+1 is also prime, where P is a Mersenne prime exponent A000043(n).
A249384
Smallest odd prime number Q such that Q*2^P+1 is also prime, where P is a Mersenne prime exponent A000043(n).
Terms
- a(0) =3a(1) =5a(2) =3a(3) =5a(4) =5a(5) =53a(6) =11a(7) =239a(8) =53a(9) =191a(10) =1229a(11) =5a(12) =233a(13) =347a(14) =1367a(15) =9767a(16) =2063a(17) =89a(18) =14009a(19) =3329a(20) =19991a(21) =50849a(22) =2711a(23) =337871a(24) =46301a(25) =2543a(26) =413093a(27) =1157111a(28) =615161a(29) =1138649
External references
- oeis: A249384