A072340 - cp's OEIS frontend

A072340 Number of steps to reach an integer starting with n/3 and iterating the map x -> x*ceiling(x), or -1 if no integer is ever reached.

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

[0, 2, 6, 0, 1, 1, 0, 5, 2, 0, 3, 2, 0, 1, 1, 0, 2, 4, 0, 3, 4, 0, 1, 1, 0, 22, 7, 0, 2, 5, 0, 1, 1, 0, 7, 2, 0, 4, 2, 0, 1, 1, 0, 2, 5, 0, 13, 9, 0, 1, 1, 0, 3, 3, 0, 2, 3, 0, 1, 1, 0, 3, 2, 0, 5, 2, 0, 1, 1, 0, 2, 3, 0, 8, 3, 0, 1, 1, 0, 5, 4, 0, 2, 4, 0, 1, 1, 0, 14, 2, 0, 3, 2, 0, 1, 1, 0, 2, 9, 0, 3, 9, 0, 1, 1]

cp's OEIS Frontend

A072340 Number of steps to reach an integer starting with n/3 and iterating the map x -> x*ceiling(x), or -1 if no integer is ever reached.

Table of values

List of values

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

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

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