A209188 - cp's OEIS frontend

A209188 Smallest prime factor of n^2 + n - 1.

n	a(n)
2	5
3	11
4	19
5	29
6	41
7	5
8	71
9	89
10	109
11	131
12	5
13	181
14	11
15	239
16	271
17	5
18	11
19	379
20	419
21	461
22	5
23	19
24	599
25	11
26	701
27	5
28	811
29	11
30	929
31	991
32	5
33	19
34	29
35	1259
36	11
37	5
38	1481
39	1559
40	11
41	1721
42	5
43	31
44	1979
45	2069
46	2161
47	5
48	2351
49	31
50	2549

[5, 11, 19, 29, 41, 5, 71, 89, 109, 131, 5, 181, 11, 239, 271, 5, 11, 379, 419, 461, 5, 19, 599, 11, 701, 5, 811, 11, 929, 991, 5, 19, 29, 1259, 11, 5, 1481, 1559, 11, 1721, 5, 31, 1979, 2069, 2161, 5, 2351, 31, 2549]

cp's OEIS Frontend

A209188 Smallest prime factor of n^2 + n - 1.

Table of values

List of values