A330356 - cp's OEIS frontend

A330356 Starting from n: as long as the decimal representation contains a prime number, replace the largest and leftmost such substring with the index of the corresponding prime number; a(n) corresponds to the final value.

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

[0, 1, 1, 1, 4, 1, 6, 4, 8, 9, 10, 1, 1, 6, 14, 6, 16, 4, 18, 8, 10, 1, 1, 9, 14, 9, 16, 14, 18, 10, 10, 1, 1, 9, 14, 9, 16, 1, 18, 10, 40, 6, 6, 14, 44, 14, 46, 6, 48, 49, 10, 1, 1, 16, 14, 9, 16, 14, 18, 4, 60, 18, 18, 18, 64, 18, 66, 8, 68, 69, 40, 10, 6, 1]

cp's OEIS Frontend

A330356 Starting from n: as long as the decimal representation contains a prime number, replace the largest and leftmost such substring with the index of the corresponding prime number; a(n) corresponds to the final value.

Table of values

List of values

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

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

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