A084598 - cp's OEIS frontend

A084598 a(1) = 2, a(2) = 3; for n >= 2, a(n+1) is smallest prime factor of (Product_{k = 1..n} a(k)) - 1.

n	a(n)
1	2
2	3
3	5
4	29
5	11
6	7
7	13
8	37
9	32222189
10	131
11	136013303998782209
12	31
13	197
14	19
15	157
16	17
17	8609
18	1831129
19	35977
20	508326079288931
21	487
22	10253
23	1390043
24	18122659735201507243
25	25319167
26	9512386441
27	85577
28	1031
29	3650460767
30	107

[2, 3, 5, 29, 11, 7, 13, 37, 32222189, 131, 136013303998782209, 31, 197, 19, 157, 17, 8609, 1831129, 35977, 508326079288931, 487, 10253, 1390043, 18122659735201507243, 25319167, 9512386441, 85577, 1031, 3650460767, 107]

cp's OEIS Frontend

A084598 a(1) = 2, a(2) = 3; for n >= 2, a(n+1) is smallest prime factor of (Product_{k = 1..n} a(k)) - 1.

Table of values

List of values