A072420 - cp's OEIS frontend

A072420 Minimum number of steps needed to transform n into 153 where each step is either tripling or taking the sum of cubes of digits.

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

[4, 4, 3, 5, 4, 3, 5, 4, 3, 4, 5, 4, 4, 4, 3, 7, 2, 2, 4, 4, 4, 6, 4, 3, 6, 5, 2, 7, 5, 3, 5, 4, 5, 5, 3, 3, 5, 5, 3, 5, 5, 3, 6, 5, 2, 6, 5, 6, 6, 4, 1, 6, 6, 5, 6, 5, 3, 6, 3, 3, 7, 5, 5, 6, 6, 5, 4, 4, 3, 5, 5, 2, 6, 5, 5, 4, 5, 4, 5, 4, 2, 6, 4, 6, 6, 5, 6]

cp's OEIS Frontend

A072420 Minimum number of steps needed to transform n into 153 where each step is either tripling or taking the sum of cubes of digits.

Table of values

List of values

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

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

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