A020900 - cp's OEIS frontend

A020900 Greatest k such that k-th prime < twice n-th prime.

n	a(n)
1	2
2	3
3	4
4	6
5	8
6	9
7	11
8	12
9	14
10	16
11	18
12	21
13	22
14	23
15	24
16	27
17	30
18	30
19	32
20	34
21	34
22	37
23	38
24	40
25	44
26	46
27	46
28	47
29	47
30	48
31	54
32	55
33	58
34	59
35	62
36	62
37	65
38	66
39	67
40	68
41	71
42	72
43	75
44	76
45	77
46	78
47	82
48	86
49	87
50	88
51	90
52	91
53	92
54	95
55	97
56	99
57	99
58	100
59	101
60	102
61	103
62	106
63	112

[2, 3, 4, 6, 8, 9, 11, 12, 14, 16, 18, 21, 22, 23, 24, 27, 30, 30, 32, 34, 34, 37, 38, 40, 44, 46, 46, 47, 47, 48, 54, 55, 58, 59, 62, 62, 65, 66, 67, 68, 71, 72, 75, 76, 77, 78, 82, 86, 87, 88, 90, 91, 92, 95, 97, 99, 99, 100, 101, 102, 103, 106, 112]

cp's OEIS Frontend

A020900 Greatest k such that k-th prime < twice n-th prime.

Table of values

List of values

n	a(n)
1	2
2	3
3	4
4	6
5	8
6	9
7	11
8	12
9	14
10	16
11	18
12	21
13	22
14	23
15	24
16	27
17	30
18	30
19	32
20	34
21	34
22	37
23	38
24	40
25	44
26	46
27	46
28	47
29	47
30	48
31	54
32	55
33	58
34	59
35	62
36	62
37	65
38	66
39	67
40	68
41	71
42	72
43	75
44	76
45	77
46	78
47	82
48	86
49	87
50	88
51	90
52	91
53	92
54	95
55	97
56	99
57	99
58	100
59	101
60	102
61	103
62	106
63	112

n	a(n)
1	2
2	3
3	4
4	6
5	8
6	9
7	11
8	12
9	14
10	16
11	18
12	21
13	22
14	23
15	24
16	27
17	30
18	30
19	32
20	34
21	34
22	37
23	38
24	40
25	44
26	46
27	46
28	47
29	47
30	48
31	54
32	55
33	58
34	59
35	62
36	62
37	65
38	66
39	67
40	68
41	71
42	72
43	75
44	76
45	77
46	78
47	82
48	86
49	87
50	88
51	90
52	91
53	92
54	95
55	97
56	99
57	99
58	100
59	101
60	102
61	103
62	106
63	112

n	a(n)
1	2
2	3
3	4
4	6
5	8
6	9
7	11
8	12
9	14
10	16
11	18
12	21
13	22
14	23
15	24
16	27
17	30
18	30
19	32
20	34
21	34
22	37
23	38
24	40
25	44
26	46
27	46
28	47
29	47
30	48
31	54
32	55
33	58
34	59
35	62
36	62
37	65
38	66
39	67
40	68
41	71
42	72
43	75
44	76
45	77
46	78
47	82
48	86
49	87
50	88
51	90
52	91
53	92
54	95
55	97
56	99
57	99
58	100
59	101
60	102
61	103
62	106
63	112