Zsigmondy numbers for a = 7, b = 5: Zs(n, 7, 5) is the greatest divisor of 7^n - 5^n that is relatively prime to 7^m - 5^m for all positive integers m < n.
A109349
Zsigmondy numbers for a = 7, b = 5: Zs(n, 7, 5) is the greatest divisor of 7^n - 5^n that is relatively prime to 7^m - 5^m for all positive integers m < n.
Terms
- a(0) =2a(1) =3a(2) =109a(3) =37a(4) =6841a(5) =13a(6) =372709a(7) =1513a(8) =176149a(9) =1661a(10) =964249309a(11) =1801a(12) =47834153641a(13) =75139a(14) =3162961a(15) =3077713a(17) =30133a(19) =3949201a(20) =6868494361a(21) =168846239a(23) =4654801
External references
- oeis: A109349