A031349 - cp's OEIS frontend

A031349 3-multiplicative persistence: number of iterations of "multiply 3rd powers of digits" needed to reach 0 or 1.

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

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

cp's OEIS Frontend

A031349 3-multiplicative persistence: number of iterations of "multiply 3rd powers of digits" needed to reach 0 or 1.

Table of values

List of values

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

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

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