A109349 - cp's OEIS frontend

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.

n	a(n)
1	2
2	3
3	109
4	37
5	6841
6	13
7	372709
8	1513
9	176149
10	1661
11	964249309
12	1801
13	47834153641
14	75139
15	3162961
16	3077713
17	115933787267041
18	30133
19	5689910849522509
20	3949201
21	6868494361
22	168846239
23	13678413205562919109
24	4654801
25	97995219736887001

[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]

cp's OEIS Frontend

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.

Table of values

List of values