a(n) = 2^n*t + 1 where t is the least x such that there exists an r in the range 2 <= r <= x+1 that is coprime to 2^n*x + 1 and has multiplicative order 2^n modulo 2^n*x + 1.
A370879
a(n) = 2^n*t + 1 where t is the least x such that there exists an r in the range 2 <= r <= x+1 that is coprime to 2^n*x + 1 and has multiplicative order 2^n modulo 2^n*x + 1.
Terms
- a(0) =3a(1) =5a(2) =17a(3) =193a(4) =353a(5) =641a(6) =769a(7) =10753a(8) =10753a(9) =13313a(10) =12289a(11) =114689a(12) =114689a(13) =163841a(14) =786433a(15) =786433a(16) =6684673a(17) =13631489a(18) =5767169a(19) =7340033a(20) =111149057a(21) =104857601a(22) =167772161a(23) =167772161a(24) =469762049a(25) =2483027969a(26) =2281701377a(27) =3221225473a(28) =12348030977a(29) =52613349377
External references
- oeis: A370879