A269251 - cp's OEIS frontend

A269251 a(n) = smallest prime in the sequence s(k) = n*s(k-1) - s(k-2), with s(0) = 1, s(1) = n - 1 (or a(n) = -1 if no such prime exists).

n	a(n)
1	-1
2	-1
3	2
4	3
5	19
6	5
7	41
8	7
9	71
10	89
11	109
12	11
13	2003
14	13
15	3121
16	239
17	271
18	17
19	729962708557509701
20	19
21	419
22	461
23	11593
24	23
25	599
26	11356201
27	701
28	11546481261621528160662473705515857458665002781273993
29	811
30	29
31	929

[-1, -1, 2, 3, 19, 5, 41, 7, 71, 89, 109, 11, 2003, 13, 3121, 239, 271, 17, 729962708557509701, 19, 419, 461, 11593, 23, 599, 11356201, 701, 11546481261621528160662473705515857458665002781273993, 811, 29, 929]

cp's OEIS Frontend

A269251 a(n) = smallest prime in the sequence s(k) = n*s(k-1) - s(k-2), with s(0) = 1, s(1) = n - 1 (or a(n) = -1 if no such prime exists).

Table of values

List of values