A377940 - cp's OEIS frontend

A377940 a(n) is the least number k such that the least j > k for which k is a primitive root is also the least j > n + k for which n + k is a primitive root, or -1 if there is no such k.

n	a(n)
1	20
2	6
3	32
4	10
5	39
6	28
7	38
8	18
9	18
10	42
11	46
12	42
13	88
14	42
15	46
16	173
17	46
18	78
19	229
20	102
21	102
22	294
23	78
24	150
25	210
26	150
27	210
28	193
29	232
30	193
31	848
32	488
33	330
34	226
35	226
36	328
37	488
38	328
39	294
40	172
41	172
42	294
43	294
44	294
45	462
46	328
47	736
48	328
49	328
50	294
51	1098
52	328
53	328
54	1196
55	172
56	172
57	1322
58	172
59	1196
60	856
61	1108
62	889

[20, 6, 32, 10, 39, 28, 38, 18, 18, 42, 46, 42, 88, 42, 46, 173, 46, 78, 229, 102, 102, 294, 78, 150, 210, 150, 210, 193, 232, 193, 848, 488, 330, 226, 226, 328, 488, 328, 294, 172, 172, 294, 294, 294, 462, 328, 736, 328, 328, 294, 1098, 328, 328, 1196, 172, 172, 1322, 172, 1196, 856, 1108, 889]

cp's OEIS Frontend

A377940 a(n) is the least number k such that the least j > k for which k is a primitive root is also the least j > n + k for which n + k is a primitive root, or -1 if there is no such k.

Table of values

List of values