A165449 - cp's OEIS frontend

A165449 Write the prime numbers in a string: 2357111317192329... (cf. A033308). The sequence gives the first position in the string for natural numbers.

n	a(n)
1	5
2	1
3	2
4	21
5	3
6	31
7	4
8	41
9	12
10	47
11	5
12	62
13	7
14	22
15	77
16	32
17	9
18	95
19	11
20	589
21	110
22	113
23	1
24	128
25	131
26	137
27	63
28	149
29	15
30	158
31	8
32	14
33	123
34	24
35	2
36	188
37	19
38	42
39	72
40	206
41	21
42	215
43	23
44	227
45	233
46	236
47	25
48	248
49	75
50	257
51	78
52	263
53	27
54	269
55	275
56	278
57	3
58	290
59	29
60	299
61	31
62	829

[5, 1, 2, 21, 3, 31, 4, 41, 12, 47, 5, 62, 7, 22, 77, 32, 9, 95, 11, 589, 110, 113, 1, 128, 131, 137, 63, 149, 15, 158, 8, 14, 123, 24, 2, 188, 19, 42, 72, 206, 21, 215, 23, 227, 233, 236, 25, 248, 75, 257, 78, 263, 27, 269, 275, 278, 3, 290, 29, 299, 31, 829]

cp's OEIS Frontend

A165449 Write the prime numbers in a string: 2357111317192329... (cf. A033308). The sequence gives the first position in the string for natural numbers.

Table of values

List of values

n	a(n)
1	5
2	1
3	2
4	21
5	3
6	31
7	4
8	41
9	12
10	47
11	5
12	62
13	7
14	22
15	77
16	32
17	9
18	95
19	11
20	589
21	110
22	113
23	1
24	128
25	131
26	137
27	63
28	149
29	15
30	158
31	8
32	14
33	123
34	24
35	2
36	188
37	19
38	42
39	72
40	206
41	21
42	215
43	23
44	227
45	233
46	236
47	25
48	248
49	75
50	257
51	78
52	263
53	27
54	269
55	275
56	278
57	3
58	290
59	29
60	299
61	31
62	829

n	a(n)
1	5
2	1
3	2
4	21
5	3
6	31
7	4
8	41
9	12
10	47
11	5
12	62
13	7
14	22
15	77
16	32
17	9
18	95
19	11
20	589
21	110
22	113
23	1
24	128
25	131
26	137
27	63
28	149
29	15
30	158
31	8
32	14
33	123
34	24
35	2
36	188
37	19
38	42
39	72
40	206
41	21
42	215
43	23
44	227
45	233
46	236
47	25
48	248
49	75
50	257
51	78
52	263
53	27
54	269
55	275
56	278
57	3
58	290
59	29
60	299
61	31
62	829

n	a(n)
1	5
2	1
3	2
4	21
5	3
6	31
7	4
8	41
9	12
10	47
11	5
12	62
13	7
14	22
15	77
16	32
17	9
18	95
19	11
20	589
21	110
22	113
23	1
24	128
25	131
26	137
27	63
28	149
29	15
30	158
31	8
32	14
33	123
34	24
35	2
36	188
37	19
38	42
39	72
40	206
41	21
42	215
43	23
44	227
45	233
46	236
47	25
48	248
49	75
50	257
51	78
52	263
53	27
54	269
55	275
56	278
57	3
58	290
59	29
60	299
61	31
62	829