A031347 - cp's OEIS frontend

A031347 Multiplicative digital root of n (keep multiplying digits of n until reaching a single digit).

n	a(n)
0	0
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	0
11	1
12	2
13	3
14	4
15	5
16	6
17	7
18	8
19	9
20	0
21	2
22	4
23	6
24	8
25	0
26	2
27	4
28	6
29	8
30	0
31	3
32	6
33	9
34	2
35	5
36	8
37	2
38	8
39	4
40	0
41	4
42	8
43	2
44	6
45	0
46	8
47	6
48	6
49	8
50	0
51	5
52	0
53	5
54	0
55	0
56	0
57	5
58	0
59	0
60	0
61	6
62	2
63	8
64	8
65	0
66	8
67	8
68	6
69	0
70	0
71	7
72	4
73	2
74	6
75	5
76	8
77	8
78	0
79	8
80	0
81	8
82	6
83	8
84	6
85	0
86	6

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 2, 4, 6, 8, 0, 2, 4, 6, 8, 0, 3, 6, 9, 2, 5, 8, 2, 8, 4, 0, 4, 8, 2, 6, 0, 8, 6, 6, 8, 0, 5, 0, 5, 0, 0, 0, 5, 0, 0, 0, 6, 2, 8, 8, 0, 8, 8, 6, 0, 0, 7, 4, 2, 6, 5, 8, 8, 0, 8, 0, 8, 6, 8, 6, 0, 6]

cp's OEIS Frontend

A031347 Multiplicative digital root of n (keep multiplying digits of n until reaching a single digit).

Table of values

List of values

n	a(n)
0	0
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	0
11	1
12	2
13	3
14	4
15	5
16	6
17	7
18	8
19	9
20	0
21	2
22	4
23	6
24	8
25	0
26	2
27	4
28	6
29	8
30	0
31	3
32	6
33	9
34	2
35	5
36	8
37	2
38	8
39	4
40	0
41	4
42	8
43	2
44	6
45	0
46	8
47	6
48	6
49	8
50	0
51	5
52	0
53	5
54	0
55	0
56	0
57	5
58	0
59	0
60	0
61	6
62	2
63	8
64	8
65	0
66	8
67	8
68	6
69	0
70	0
71	7
72	4
73	2
74	6
75	5
76	8
77	8
78	0
79	8
80	0
81	8
82	6
83	8
84	6
85	0
86	6

n	a(n)
0	0
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	0
11	1
12	2
13	3
14	4
15	5
16	6
17	7
18	8
19	9
20	0
21	2
22	4
23	6
24	8
25	0
26	2
27	4
28	6
29	8
30	0
31	3
32	6
33	9
34	2
35	5
36	8
37	2
38	8
39	4
40	0
41	4
42	8
43	2
44	6
45	0
46	8
47	6
48	6
49	8
50	0
51	5
52	0
53	5
54	0
55	0
56	0
57	5
58	0
59	0
60	0
61	6
62	2
63	8
64	8
65	0
66	8
67	8
68	6
69	0
70	0
71	7
72	4
73	2
74	6
75	5
76	8
77	8
78	0
79	8
80	0
81	8
82	6
83	8
84	6
85	0
86	6

n	a(n)
0	0
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	0
11	1
12	2
13	3
14	4
15	5
16	6
17	7
18	8
19	9
20	0
21	2
22	4
23	6
24	8
25	0
26	2
27	4
28	6
29	8
30	0
31	3
32	6
33	9
34	2
35	5
36	8
37	2
38	8
39	4
40	0
41	4
42	8
43	2
44	6
45	0
46	8
47	6
48	6
49	8
50	0
51	5
52	0
53	5
54	0
55	0
56	0
57	5
58	0
59	0
60	0
61	6
62	2
63	8
64	8
65	0
66	8
67	8
68	6
69	0
70	0
71	7
72	4
73	2
74	6
75	5
76	8
77	8
78	0
79	8
80	0
81	8
82	6
83	8
84	6
85	0
86	6