A075120 - cp's OEIS frontend

A075120 Number of steps to reach the first integer (= A075121(n)) starting with n/floor(sqrt(n)) and iterating the map x -> x*ceiling(x), or -1 if no integer is ever reached.

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

[0, 0, 0, 0, 2, 0, 1, 0, 0, 5, 2, 0, 3, 2, 0, 0, 3, 3, 2, 0, 2, 1, 3, 0, 0, 8, 3, 5, 2, 0, 3, 2, 5, 3, 0, 0, 6, 2, 2, 4, 2, 0, 5, 3, 1, 4, 2, 0, 0, 7, 12, 5, 11, 12, 2, 0, 4, 3, 9, 12, 6, 16, 0, 0, 3, 7, 8, 4, 4, 4, 2, 0, 2, 4, 5, 1, 5, 2, 5, 0, 0, 7, 3, 22, 3, 3]

cp's OEIS Frontend

A075120 Number of steps to reach the first integer (= A075121(n)) starting with n/floor(sqrt(n)) 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)
1	0
2	0
3	0
4	0
5	2
6	0
7	1
8	0
9	0
10	5
11	2
12	0
13	3
14	2
15	0
16	0
17	3
18	3
19	2
20	0
21	2
22	1
23	3
24	0
25	0
26	8
27	3
28	5
29	2
30	0
31	3
32	2
33	5
34	3
35	0
36	0
37	6
38	2
39	2
40	4
41	2
42	0
43	5
44	3
45	1
46	4
47	2
48	0
49	0
50	7
51	12
52	5
53	11
54	12
55	2
56	0
57	4
58	3
59	9
60	12
61	6
62	16
63	0
64	0
65	3
66	7
67	8
68	4
69	4
70	4
71	2
72	0
73	2
74	4
75	5
76	1
77	5
78	2
79	5
80	0
81	0
82	7
83	3
84	22
85	3
86	3

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

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