Zsigmondy numbers for a = 2, b = 1: Zs(n, 2, 1) is the greatest divisor of 2^n - 1 (A000225) that is coprime to 2^m - 1 for all positive integers m < n.
A064078
Zsigmondy numbers for a = 2, b = 1: Zs(n, 2, 1) is the greatest divisor of 2^n - 1 (A000225) that is coprime to 2^m - 1 for all positive integers m < n.
Terms
- a(0) =1a(1) =3a(2) =7a(3) =5a(4) =31a(5) =1a(6) =127a(7) =17a(8) =73a(9) =11a(10) =2047a(11) =13a(12) =8191a(13) =43a(14) =151a(15) =257a(16) =131071a(17) =19a(18) =524287a(19) =41a(20) =337a(21) =683a(22) =8388607a(23) =241a(24) =1082401a(25) =2731a(26) =262657a(27) =3277a(28) =536870911a(29) =331
External references
- oeis: A064078