A347694 - cp's OEIS frontend

A347694 Largest k <= 2*n such that k is a prime or twice a prime.

n	a(n)
1	2
2	4
3	6
4	7
5	10
6	11
7	14
8	14
9	17
10	19
11	22
12	23
13	26
14	26
15	29
16	31
17	34
18	34
19	38
20	38
21	41
22	43
23	46
24	47
25	47
26	47
27	53
28	53
29	58
30	59
31	62
32	62
33	62
34	67
35	67
36	71
37	74
38	74
39	74
40	79
41	82
42	83
43	86
44	86
45	89
46	89
47	94
48	94
49	97
50	97
51	101
52	103
53	106
54	107
55	109
56	109
57	113
58	113
59	118
60	118
61	122
62	122
63	122
64	127
65	127
66	131
67	134
68	134
69	137
70	139

[2, 4, 6, 7, 10, 11, 14, 14, 17, 19, 22, 23, 26, 26, 29, 31, 34, 34, 38, 38, 41, 43, 46, 47, 47, 47, 53, 53, 58, 59, 62, 62, 62, 67, 67, 71, 74, 74, 74, 79, 82, 83, 86, 86, 89, 89, 94, 94, 97, 97, 101, 103, 106, 107, 109, 109, 113, 113, 118, 118, 122, 122, 122, 127, 127, 131, 134, 134, 137, 139]

cp's OEIS Frontend

A347694 Largest k <= 2*n such that k is a prime or twice a prime.

Table of values

List of values

n	a(n)
1	2
2	4
3	6
4	7
5	10
6	11
7	14
8	14
9	17
10	19
11	22
12	23
13	26
14	26
15	29
16	31
17	34
18	34
19	38
20	38
21	41
22	43
23	46
24	47
25	47
26	47
27	53
28	53
29	58
30	59
31	62
32	62
33	62
34	67
35	67
36	71
37	74
38	74
39	74
40	79
41	82
42	83
43	86
44	86
45	89
46	89
47	94
48	94
49	97
50	97
51	101
52	103
53	106
54	107
55	109
56	109
57	113
58	113
59	118
60	118
61	122
62	122
63	122
64	127
65	127
66	131
67	134
68	134
69	137
70	139

n	a(n)
1	2
2	4
3	6
4	7
5	10
6	11
7	14
8	14
9	17
10	19
11	22
12	23
13	26
14	26
15	29
16	31
17	34
18	34
19	38
20	38
21	41
22	43
23	46
24	47
25	47
26	47
27	53
28	53
29	58
30	59
31	62
32	62
33	62
34	67
35	67
36	71
37	74
38	74
39	74
40	79
41	82
42	83
43	86
44	86
45	89
46	89
47	94
48	94
49	97
50	97
51	101
52	103
53	106
54	107
55	109
56	109
57	113
58	113
59	118
60	118
61	122
62	122
63	122
64	127
65	127
66	131
67	134
68	134
69	137
70	139

n	a(n)
1	2
2	4
3	6
4	7
5	10
6	11
7	14
8	14
9	17
10	19
11	22
12	23
13	26
14	26
15	29
16	31
17	34
18	34
19	38
20	38
21	41
22	43
23	46
24	47
25	47
26	47
27	53
28	53
29	58
30	59
31	62
32	62
33	62
34	67
35	67
36	71
37	74
38	74
39	74
40	79
41	82
42	83
43	86
44	86
45	89
46	89
47	94
48	94
49	97
50	97
51	101
52	103
53	106
54	107
55	109
56	109
57	113
58	113
59	118
60	118
61	122
62	122
63	122
64	127
65	127
66	131
67	134
68	134
69	137
70	139