A351079 - cp's OEIS frontend

A351079 a(n) is the largest term encountered on the path from n to 0 when iterating the map x -> x', or 0 if 0 cannot be reached from n (or if n is 0). Here x' is the arithmetic derivative of x, A003415.

n	a(n)
0	0
1	1
2	2
3	3
4	0
5	5
6	6
7	7
8	0
9	9
10	10
11	11
12	0
13	13
14	14
15	0
16	0
17	17
18	21
19	19
20	0
21	21
22	22
23	23
24	0
25	25
26	0
27	0
28	0
29	29
30	31
31	31
32	0
33	33
34	34
35	0
36	0
37	37
38	38
39	0
40	0
41	41
42	42
43	43
44	0
45	0
46	46
47	47
48	0
49	49
50	0
51	0
52	0
53	53
54	0
55	0
56	0
57	57
58	58
59	59
60	0
61	61
62	62
63	0
64	0
65	65
66	66
67	67
68	0
69	0
70	70
71	71
72	0
73	73
74	0
75	0
76	0
77	77
78	78
79	79
80	0
81	0
82	82
83	83
84	0
85	85
86	0
87	0
88	0
89	89

[0, 1, 2, 3, 0, 5, 6, 7, 0, 9, 10, 11, 0, 13, 14, 0, 0, 17, 21, 19, 0, 21, 22, 23, 0, 25, 0, 0, 0, 29, 31, 31, 0, 33, 34, 0, 0, 37, 38, 0, 0, 41, 42, 43, 0, 0, 46, 47, 0, 49, 0, 0, 0, 53, 0, 0, 0, 57, 58, 59, 0, 61, 62, 0, 0, 65, 66, 67, 0, 0, 70, 71, 0, 73, 0, 0, 0, 77, 78, 79, 0, 0, 82, 83, 0, 85, 0, 0, 0, 89]

cp's OEIS Frontend

A351079 a(n) is the largest term encountered on the path from n to 0 when iterating the map x -> x', or 0 if 0 cannot be reached from n (or if n is 0). Here x' is the arithmetic derivative of x, A003415.

Table of values

List of values

n	a(n)
0	0
1	1
2	2
3	3
4	0
5	5
6	6
7	7
8	0
9	9
10	10
11	11
12	0
13	13
14	14
15	0
16	0
17	17
18	21
19	19
20	0
21	21
22	22
23	23
24	0
25	25
26	0
27	0
28	0
29	29
30	31
31	31
32	0
33	33
34	34
35	0
36	0
37	37
38	38
39	0
40	0
41	41
42	42
43	43
44	0
45	0
46	46
47	47
48	0
49	49
50	0
51	0
52	0
53	53
54	0
55	0
56	0
57	57
58	58
59	59
60	0
61	61
62	62
63	0
64	0
65	65
66	66
67	67
68	0
69	0
70	70
71	71
72	0
73	73
74	0
75	0
76	0
77	77
78	78
79	79
80	0
81	0
82	82
83	83
84	0
85	85
86	0
87	0
88	0
89	89

n	a(n)
0	0
1	1
2	2
3	3
4	0
5	5
6	6
7	7
8	0
9	9
10	10
11	11
12	0
13	13
14	14
15	0
16	0
17	17
18	21
19	19
20	0
21	21
22	22
23	23
24	0
25	25
26	0
27	0
28	0
29	29
30	31
31	31
32	0
33	33
34	34
35	0
36	0
37	37
38	38
39	0
40	0
41	41
42	42
43	43
44	0
45	0
46	46
47	47
48	0
49	49
50	0
51	0
52	0
53	53
54	0
55	0
56	0
57	57
58	58
59	59
60	0
61	61
62	62
63	0
64	0
65	65
66	66
67	67
68	0
69	0
70	70
71	71
72	0
73	73
74	0
75	0
76	0
77	77
78	78
79	79
80	0
81	0
82	82
83	83
84	0
85	85
86	0
87	0
88	0
89	89

n	a(n)
0	0
1	1
2	2
3	3
4	0
5	5
6	6
7	7
8	0
9	9
10	10
11	11
12	0
13	13
14	14
15	0
16	0
17	17
18	21
19	19
20	0
21	21
22	22
23	23
24	0
25	25
26	0
27	0
28	0
29	29
30	31
31	31
32	0
33	33
34	34
35	0
36	0
37	37
38	38
39	0
40	0
41	41
42	42
43	43
44	0
45	0
46	46
47	47
48	0
49	49
50	0
51	0
52	0
53	53
54	0
55	0
56	0
57	57
58	58
59	59
60	0
61	61
62	62
63	0
64	0
65	65
66	66
67	67
68	0
69	0
70	70
71	71
72	0
73	73
74	0
75	0
76	0
77	77
78	78
79	79
80	0
81	0
82	82
83	83
84	0
85	85
86	0
87	0
88	0
89	89