A330634 - cp's OEIS frontend

A330634 The number of iterations of A330633, the concatenation of the product of adjacent digits, for starting value n before reaching 0, or -1 if this never happens.

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

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

cp's OEIS Frontend

A330634 The number of iterations of A330633, the concatenation of the product of adjacent digits, for starting value n before reaching 0, or -1 if this never happens.

Table of values

List of values

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

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

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