A327966 - cp's OEIS frontend

A327966 Number of iterations of "tamed variant of arithmetic derivative", A327965 needed to reach 0 from n, or -1 if zero is never reached.

n	a(n)
0	0
1	1
2	2
3	2
4	2
5	2
6	3
7	2
8	3
9	4
10	3
11	2
12	2
13	2
14	5
15	3
16	3
17	2
18	5
19	2
20	4
21	4
22	3
23	2
24	3
25	4
26	4
27	2
28	3
29	2
30	3
31	2
32	3
33	6
34	3
35	3
36	4
37	2
38	5
39	2
40	3
41	2
42	3
43	2
44	3
45	3
46	5
47	2
48	3
49	6
50	4
51	3
52	6
53	2
54	3
55	2
56	3
57	4
58	3
59	2
60	3
61	2
62	7
63	4
64	3
65	6
66	3
67	2
68	6
69	5
70	3
71	2
72	3
73	2
74	3
75	3
76	3
77	6
78	3
79	2
80	3
81	2
82	3
83	2
84	3
85	4
86	4
87	3
88	4
89	2
90	4
91	3
92	4
93	4
94	7
95	4
96	3
97	2
98	7
99	4
100	4
101	2
102	4
103	2
104	3
105	3
106	3
107	2
108	3
109	2
110	4
111	4
112	4
113	2
114	3
115	3
116	4
117	4
118	3
119	4
120	3

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

cp's OEIS Frontend

A327966 Number of iterations of "tamed variant of arithmetic derivative", A327965 needed to reach 0 from n, or -1 if zero is never reached.

Table of values

List of values

n	a(n)
0	0
1	1
2	2
3	2
4	2
5	2
6	3
7	2
8	3
9	4
10	3
11	2
12	2
13	2
14	5
15	3
16	3
17	2
18	5
19	2
20	4
21	4
22	3
23	2
24	3
25	4
26	4
27	2
28	3
29	2
30	3
31	2
32	3
33	6
34	3
35	3
36	4
37	2
38	5
39	2
40	3
41	2
42	3
43	2
44	3
45	3
46	5
47	2
48	3
49	6
50	4
51	3
52	6
53	2
54	3
55	2
56	3
57	4
58	3
59	2
60	3
61	2
62	7
63	4
64	3
65	6
66	3
67	2
68	6
69	5
70	3
71	2
72	3
73	2
74	3
75	3
76	3
77	6
78	3
79	2
80	3
81	2
82	3
83	2
84	3
85	4
86	4
87	3
88	4
89	2
90	4
91	3
92	4
93	4
94	7
95	4
96	3
97	2
98	7
99	4
100	4
101	2
102	4
103	2
104	3
105	3
106	3
107	2
108	3
109	2
110	4
111	4
112	4
113	2
114	3
115	3
116	4
117	4
118	3
119	4
120	3

n	a(n)
0	0
1	1
2	2
3	2
4	2
5	2
6	3
7	2
8	3
9	4
10	3
11	2
12	2
13	2
14	5
15	3
16	3
17	2
18	5
19	2
20	4
21	4
22	3
23	2
24	3
25	4
26	4
27	2
28	3
29	2
30	3
31	2
32	3
33	6
34	3
35	3
36	4
37	2
38	5
39	2
40	3
41	2
42	3
43	2
44	3
45	3
46	5
47	2
48	3
49	6
50	4
51	3
52	6
53	2
54	3
55	2
56	3
57	4
58	3
59	2
60	3
61	2
62	7
63	4
64	3
65	6
66	3
67	2
68	6
69	5
70	3
71	2
72	3
73	2
74	3
75	3
76	3
77	6
78	3
79	2
80	3
81	2
82	3
83	2
84	3
85	4
86	4
87	3
88	4
89	2
90	4
91	3
92	4
93	4
94	7
95	4
96	3
97	2
98	7
99	4
100	4
101	2
102	4
103	2
104	3
105	3
106	3
107	2
108	3
109	2
110	4
111	4
112	4
113	2
114	3
115	3
116	4
117	4
118	3
119	4
120	3

n	a(n)
0	0
1	1
2	2
3	2
4	2
5	2
6	3
7	2
8	3
9	4
10	3
11	2
12	2
13	2
14	5
15	3
16	3
17	2
18	5
19	2
20	4
21	4
22	3
23	2
24	3
25	4
26	4
27	2
28	3
29	2
30	3
31	2
32	3
33	6
34	3
35	3
36	4
37	2
38	5
39	2
40	3
41	2
42	3
43	2
44	3
45	3
46	5
47	2
48	3
49	6
50	4
51	3
52	6
53	2
54	3
55	2
56	3
57	4
58	3
59	2
60	3
61	2
62	7
63	4
64	3
65	6
66	3
67	2
68	6
69	5
70	3
71	2
72	3
73	2
74	3
75	3
76	3
77	6
78	3
79	2
80	3
81	2
82	3
83	2
84	3
85	4
86	4
87	3
88	4
89	2
90	4
91	3
92	4
93	4
94	7
95	4
96	3
97	2
98	7
99	4
100	4
101	2
102	4
103	2
104	3
105	3
106	3
107	2
108	3
109	2
110	4
111	4
112	4
113	2
114	3
115	3
116	4
117	4
118	3
119	4
120	3