A098174 - cp's OEIS frontend

A098174 a(n) is the smallest e > 0 such that the initial digit of n^e = 1 in decimal representation.

n	a(n)
1	1
2	4
3	9
4	2
5	3
6	4
7	5
8	8
9	16
10	1
11	1
12	1
13	1
14	1
15	1
16	1
17	1
18	1
19	1
20	4
21	4
22	3
23	3
24	3
25	3
26	3
27	3
28	5
29	7
30	9
31	25
32	2
33	2
34	2
35	2
36	2
37	2
38	2
39	2
40	2
41	2
42	2
43	2
44	2
45	5
46	11
47	3
48	3
49	3
50	3
51	3
52	3
53	3
54	3
55	3
56	3
57	3
58	3
59	4
60	4
61	4
62	4
63	4
64	4
65	4
66	4
67	5
68	5
69	5
70	5
71	5
72	5
73	6
74	6
75	6
76	6
77	7
78	7
79	7
80	8
81	8
82	9
83	9
84	10
85	10
86	11
87	12
88	13
89	14
90	16
91	18
92	20
93	23
94	27
95	32
96	40
97	53

[1, 4, 9, 2, 3, 4, 5, 8, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 4, 4, 3, 3, 3, 3, 3, 3, 5, 7, 9, 25, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 5, 11, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 8, 8, 9, 9, 10, 10, 11, 12, 13, 14, 16, 18, 20, 23, 27, 32, 40, 53]

cp's OEIS Frontend

A098174 a(n) is the smallest e > 0 such that the initial digit of n^e = 1 in decimal representation.

Table of values

List of values

n	a(n)
1	1
2	4
3	9
4	2
5	3
6	4
7	5
8	8
9	16
10	1
11	1
12	1
13	1
14	1
15	1
16	1
17	1
18	1
19	1
20	4
21	4
22	3
23	3
24	3
25	3
26	3
27	3
28	5
29	7
30	9
31	25
32	2
33	2
34	2
35	2
36	2
37	2
38	2
39	2
40	2
41	2
42	2
43	2
44	2
45	5
46	11
47	3
48	3
49	3
50	3
51	3
52	3
53	3
54	3
55	3
56	3
57	3
58	3
59	4
60	4
61	4
62	4
63	4
64	4
65	4
66	4
67	5
68	5
69	5
70	5
71	5
72	5
73	6
74	6
75	6
76	6
77	7
78	7
79	7
80	8
81	8
82	9
83	9
84	10
85	10
86	11
87	12
88	13
89	14
90	16
91	18
92	20
93	23
94	27
95	32
96	40
97	53

n	a(n)
1	1
2	4
3	9
4	2
5	3
6	4
7	5
8	8
9	16
10	1
11	1
12	1
13	1
14	1
15	1
16	1
17	1
18	1
19	1
20	4
21	4
22	3
23	3
24	3
25	3
26	3
27	3
28	5
29	7
30	9
31	25
32	2
33	2
34	2
35	2
36	2
37	2
38	2
39	2
40	2
41	2
42	2
43	2
44	2
45	5
46	11
47	3
48	3
49	3
50	3
51	3
52	3
53	3
54	3
55	3
56	3
57	3
58	3
59	4
60	4
61	4
62	4
63	4
64	4
65	4
66	4
67	5
68	5
69	5
70	5
71	5
72	5
73	6
74	6
75	6
76	6
77	7
78	7
79	7
80	8
81	8
82	9
83	9
84	10
85	10
86	11
87	12
88	13
89	14
90	16
91	18
92	20
93	23
94	27
95	32
96	40
97	53

n	a(n)
1	1
2	4
3	9
4	2
5	3
6	4
7	5
8	8
9	16
10	1
11	1
12	1
13	1
14	1
15	1
16	1
17	1
18	1
19	1
20	4
21	4
22	3
23	3
24	3
25	3
26	3
27	3
28	5
29	7
30	9
31	25
32	2
33	2
34	2
35	2
36	2
37	2
38	2
39	2
40	2
41	2
42	2
43	2
44	2
45	5
46	11
47	3
48	3
49	3
50	3
51	3
52	3
53	3
54	3
55	3
56	3
57	3
58	3
59	4
60	4
61	4
62	4
63	4
64	4
65	4
66	4
67	5
68	5
69	5
70	5
71	5
72	5
73	6
74	6
75	6
76	6
77	7
78	7
79	7
80	8
81	8
82	9
83	9
84	10
85	10
86	11
87	12
88	13
89	14
90	16
91	18
92	20
93	23
94	27
95	32
96	40
97	53