A212813 - cp's OEIS frontend

A212813 Number of steps for n to reach 8 under iteration of the map i -> A036288(i), or -1 if 8 is never reached.

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

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

cp's OEIS Frontend

A212813 Number of steps for n to reach 8 under iteration of the map i -> A036288(i), or -1 if 8 is never reached.

Table of values

List of values

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

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

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