A222819 - cp's OEIS frontend

A222819 a(n) = number of nontrivial reverse multipliers for base n.

n	a(n)
2	0
3	1
4	1
5	2
6	2
7	2
8	4
9	3
10	2
11	5
12	4
13	3
14	6
15	6
16	3
17	7
18	5
19	7
20	7
21	6
22	5
23	10
24	10
25	5
26	7
27	8
28	5
29	12
30	11
31	9
32	12
33	5
34	8
35	13
36	9
37	8
38	12
39	16
40	8
41	14
42	11
43	12
44	16
45	12
46	10
47	19
48	15
49	11
50	11
51	9
52	10
53	19
54	18
55	17
56	18
57	13
58	9
59	23
60	14
61	15
62	21
63	19
64	14
65	19
66	12
67	18
68	16
69	19
70	17
71	26
72	17
73	11
74	20
75	16
76	15
77	21
78	13
79	26
80	24
81	13

[0, 1, 1, 2, 2, 2, 4, 3, 2, 5, 4, 3, 6, 6, 3, 7, 5, 7, 7, 6, 5, 10, 10, 5, 7, 8, 5, 12, 11, 9, 12, 5, 8, 13, 9, 8, 12, 16, 8, 14, 11, 12, 16, 12, 10, 19, 15, 11, 11, 9, 10, 19, 18, 17, 18, 13, 9, 23, 14, 15, 21, 19, 14, 19, 12, 18, 16, 19, 17, 26, 17, 11, 20, 16, 15, 21, 13, 26, 24, 13]

cp's OEIS Frontend

A222819 a(n) = number of nontrivial reverse multipliers for base n.

Table of values

List of values

n	a(n)
2	0
3	1
4	1
5	2
6	2
7	2
8	4
9	3
10	2
11	5
12	4
13	3
14	6
15	6
16	3
17	7
18	5
19	7
20	7
21	6
22	5
23	10
24	10
25	5
26	7
27	8
28	5
29	12
30	11
31	9
32	12
33	5
34	8
35	13
36	9
37	8
38	12
39	16
40	8
41	14
42	11
43	12
44	16
45	12
46	10
47	19
48	15
49	11
50	11
51	9
52	10
53	19
54	18
55	17
56	18
57	13
58	9
59	23
60	14
61	15
62	21
63	19
64	14
65	19
66	12
67	18
68	16
69	19
70	17
71	26
72	17
73	11
74	20
75	16
76	15
77	21
78	13
79	26
80	24
81	13

n	a(n)
2	0
3	1
4	1
5	2
6	2
7	2
8	4
9	3
10	2
11	5
12	4
13	3
14	6
15	6
16	3
17	7
18	5
19	7
20	7
21	6
22	5
23	10
24	10
25	5
26	7
27	8
28	5
29	12
30	11
31	9
32	12
33	5
34	8
35	13
36	9
37	8
38	12
39	16
40	8
41	14
42	11
43	12
44	16
45	12
46	10
47	19
48	15
49	11
50	11
51	9
52	10
53	19
54	18
55	17
56	18
57	13
58	9
59	23
60	14
61	15
62	21
63	19
64	14
65	19
66	12
67	18
68	16
69	19
70	17
71	26
72	17
73	11
74	20
75	16
76	15
77	21
78	13
79	26
80	24
81	13

n	a(n)
2	0
3	1
4	1
5	2
6	2
7	2
8	4
9	3
10	2
11	5
12	4
13	3
14	6
15	6
16	3
17	7
18	5
19	7
20	7
21	6
22	5
23	10
24	10
25	5
26	7
27	8
28	5
29	12
30	11
31	9
32	12
33	5
34	8
35	13
36	9
37	8
38	12
39	16
40	8
41	14
42	11
43	12
44	16
45	12
46	10
47	19
48	15
49	11
50	11
51	9
52	10
53	19
54	18
55	17
56	18
57	13
58	9
59	23
60	14
61	15
62	21
63	19
64	14
65	19
66	12
67	18
68	16
69	19
70	17
71	26
72	17
73	11
74	20
75	16
76	15
77	21
78	13
79	26
80	24
81	13