A381963 - cp's OEIS frontend

A381963 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 digital sum of x (A007953).

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

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 11, 2, 12, 3, 13, 4, 14, 5, 15, 6, 16, 7, 17, 8, 18, 9, 19, 10, 1, 20, 2, 21, 3, 22, 4, 23, 5, 24, 6, 25, 7, 26, 8, 27, 9, 28, 10, 1, 29, 11, 2, 30, 3, 31, 4, 32, 5, 33, 6, 34, 7, 35, 8, 36, 9, 37, 10, 1, 38, 11, 2, 39, 12, 3]

cp's OEIS Frontend

A381963 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 digital sum of x (A007953).

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

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

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