A276373 - cp's OEIS frontend

A276373 Least k such that phi(kn-1) = phi(kn+1), or -1 if no such k exists.

n	a(n)
1	5
2	4
3	3
4	2
5	1
6	106
7	21
8	1
9	1
10	39282
11	1
12	53
13	135
14	65014
15	5
16	9489
17	171
18	361
19	27
20	19641
21	7
22	13133
23	141
24	6326
25	3
26	6978
27	1
28	32507
29	375
30	13094
31	165
32	93186
33	1
34	1359
35	9
36	12588
37	15
38	171
39	45
40	35253
41	3
42	35794
43	9
44	16796
45	7
46	1689
47	69
48	3163
49	3
50	13653
51	57
52	3489
53	12
54	249
55	45
56	58497
57	9

[5, 4, 3, 2, 1, 106, 21, 1, 1, 39282, 1, 53, 135, 65014, 5, 9489, 171, 361, 27, 19641, 7, 13133, 141, 6326, 3, 6978, 1, 32507, 375, 13094, 165, 93186, 1, 1359, 9, 12588, 15, 171, 45, 35253, 3, 35794, 9, 16796, 7, 1689, 69, 3163, 3, 13653, 57, 3489, 12, 249, 45, 58497, 9]

cp's OEIS Frontend

A276373 Least k such that phi(kn-1) = phi(kn+1), or -1 if no such k exists.

Table of values

List of values

cp's OEIS Frontend

A276373 Least k such that phi(k*n-1) = phi(k*n+1), or -1 if no such k exists.

Table of values

List of values

A276373 Least k such that phi(kn-1) = phi(kn+1), or -1 if no such k exists.