A241181 - cp's OEIS frontend

A241181 Start with n; add to it any of its digits; repeat; a(n) = minimal number of steps needed to reach a prime.

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

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

cp's OEIS Frontend

A241181 Start with n; add to it any of its digits; repeat; a(n) = minimal number of steps needed to reach a prime.

Table of values

List of values

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

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

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