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.

2, 3, 109, 37, 6841, 13, 372709, 1513, 176149, 1661, 964249309, 1801, 47834153641, 75139, 3162961, 3077713, 115933787267041, 30133, 5689910849522509, 3949201, 6868494361, 168846239, 13678413205562919109, 4654801, 97995219736887001

Offset: 1

Author

Jonathan Vos Post, Aug 21 2005

Keywords

• nonn

Links

• Eric Weisstein's World of Mathematics, Zsigmondy's Theorem

Crossrefs

Cf. A064078-A064083, A109325, A109347, A109348.

Extensions

Edited, corrected and extended by Ray Chandler, Aug 26 2005

Definition corrected by Jerry Metzger, Nov 04 2009