A241183 - cp's OEIS frontend

A241183 Start with n; add to it any of its digits; repeat; a(n) = minimal number of steps needed to reach 2n, or -1 if 2n cannot be reached.

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

[1, 1, 1, 1, 1, 1, 1, 1, 1, 5, 4, 4, 3, 3, 5, 4, 4, 3, 7, 6, 5, 5, 5, 4, 5, 5, 5, 4, 5, 7, 6, 6, 7, 6, 6, 7, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, -1, 8, 8, 8, 7, 8, 8, 8, 8, 8, 10, 9, 9, 9, 10, 11, 10, 10, 10, 11, 12, 11, 12, 12, 11, 12, 12, 14, 12, 13, 15, 12, 13, 14, 14, 14, 14, 14, 15, 14, 14, 16, 16, 16, 15, 15, 17, 16, 15, 15, 18]

cp's OEIS Frontend

A241183 Start with n; add to it any of its digits; repeat; a(n) = minimal number of steps needed to reach 2n, or -1 if 2n cannot be 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	1
9	1
10	5
11	4
12	4
13	3
14	3
15	5
16	4
17	4
18	3
19	7
20	6
21	5
22	5
23	5
24	4
25	5
26	5
27	5
28	4
29	5
30	7
31	6
32	6
33	7
34	6
35	6
36	7
37	6
38	6
39	6
40	7
41	7
42	7
43	7
44	7
45	7
46	7
47	7
48	7
49	7
50	-1
51	8
52	8
53	8
54	7
55	8
56	8
57	8
58	8
59	8
60	10
61	9
62	9
63	9
64	10
65	11
66	10
67	10
68	10
69	11
70	12
71	11
72	12
73	12
74	11
75	12
76	12
77	14
78	12
79	13
80	15
81	12
82	13
83	14
84	14
85	14
86	14
87	14
88	15
89	14
90	14
91	16
92	16
93	16
94	15
95	15
96	17
97	16
98	15
99	15
100	18

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

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