Cullen semiprimes: Semiprimes of the form k*2^k + 1.
A242116
Cullen semiprimes: Semiprimes of the form k*2^k + 1.
Terms
- a(0) =9a(1) =25a(2) =65a(3) =161a(4) =2049a(5) =4609a(6) =22529a(7) =1048577a(8) =44040193a(9) =283467841537
External references
- oeis: A242116