A003681 - cp's OEIS frontend

A003681 a(n) = min { p +- q : p +- q > 1 and p*q = Product_{k=1..n-1} a(k) }.

n	a(n)
1	2
2	3
3	5
4	7
5	11
6	13
7	17
8	107
9	197
10	3293
11	74057
12	1124491
13	1225063003
14	48403915086083
15	229199690093487791653
16	139394989871393443893426292667
17	2310767115930351361890156080500119173238113
18	521722354210765171422123515738862106081757768167379798858040637

[2, 3, 5, 7, 11, 13, 17, 107, 197, 3293, 74057, 1124491, 1225063003, 48403915086083, 229199690093487791653, 139394989871393443893426292667, 2310767115930351361890156080500119173238113, 521722354210765171422123515738862106081757768167379798858040637]

cp's OEIS Frontend

A003681 a(n) = min { p +- q : p +- q > 1 and p*q = Product_{k=1..n-1} a(k) }.

Table of values

List of values