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

1,1

Links

Table of n, a(n) for n=1..25.

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

Crossrefs

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

Sequence in context: A097653 A164926 A129729 * A330842 A235619 A242386

Adjacent sequences: A109346 A109347 A109348 * A109350 A109351 A109352

Keyword

nonn

Author

Jonathan Vos Post, Aug 21 2005

Extensions

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

Definition corrected by Jerry Metzger, Nov 04 2009

Status

approved