A381965 - cp's OEIS frontend

A381965 Irregular triangle read by rows, where row n lists the iterates of f(x), starting at x = n until f(x) < 10, where f(x) is the multiplicative digital root of x (A031347).

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

[0, 1, 2, 3, 4, 5, 6, 7, 8, 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, 10, 0, 26, 12, 2, 27, 14, 4, 28, 16, 6, 29, 18, 8, 30, 0, 31, 3, 32, 6, 33, 9, 34, 12, 2, 35, 15, 5, 36, 18, 8, 37, 21, 2]

cp's OEIS Frontend

A381965 Irregular triangle read by rows, where row n lists the iterates of f(x), starting at x = n until f(x) < 10, where f(x) is the multiplicative digital root of x (A031347).

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

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

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