A300081 - cp's OEIS frontend

A300081 a(n) is the number of steps needed to reach 1 or 89 under iteration of sum-of-squares-of-digits map.

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

[0, 5, 7, 4, 4, 9, 5, 5, 6, 1, 6, 5, 2, 6, 6, 3, 5, 5, 4, 5, 5, 6, 3, 6, 3, 5, 6, 3, 2, 7, 2, 3, 6, 4, 5, 8, 2, 3, 7, 4, 6, 6, 4, 4, 7, 4, 5, 6, 4, 4, 6, 3, 5, 7, 5, 4, 6, 1, 4, 9, 3, 5, 8, 4, 4, 7, 2, 2, 8, 5, 5, 6, 2, 5, 6, 2, 9, 8, 3, 5, 5, 3, 3, 6, 1, 2, 8, 10, 0]

cp's OEIS Frontend

A300081 a(n) is the number of steps needed to reach 1 or 89 under iteration of sum-of-squares-of-digits map.

Table of values

List of values

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

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

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