A026423 - cp's OEIS frontend

A026423 a(n) = least positive integer > a(n-1) and not a(i)*a(j) for 1<=i<=j<=n, n >= 2.

n	a(n)
1	1
2	3
3	4
4	5
5	6
6	7
7	8
8	10
9	11
10	13
11	14
12	17
13	19
14	22
15	23
16	26
17	27
18	29
19	31
20	34
21	37
22	38
23	41
24	43
25	45
26	46
27	47
28	53
29	54
30	58
31	59
32	61
33	62
34	63
35	67
36	71
37	72
38	73
39	74
40	75
41	79
42	82
43	83
44	86
45	89
46	90
47	94
48	96
49	97
50	99
51	101
52	103
53	105
54	106
55	107
56	109
57	113
58	117
59	118
60	120

[1, 3, 4, 5, 6, 7, 8, 10, 11, 13, 14, 17, 19, 22, 23, 26, 27, 29, 31, 34, 37, 38, 41, 43, 45, 46, 47, 53, 54, 58, 59, 61, 62, 63, 67, 71, 72, 73, 74, 75, 79, 82, 83, 86, 89, 90, 94, 96, 97, 99, 101, 103, 105, 106, 107, 109, 113, 117, 118, 120]

cp's OEIS Frontend

A026423 a(n) = least positive integer > a(n-1) and not a(i)*a(j) for 1<=i<=j<=n, n >= 2.

Table of values

List of values

n	a(n)
1	1
2	3
3	4
4	5
5	6
6	7
7	8
8	10
9	11
10	13
11	14
12	17
13	19
14	22
15	23
16	26
17	27
18	29
19	31
20	34
21	37
22	38
23	41
24	43
25	45
26	46
27	47
28	53
29	54
30	58
31	59
32	61
33	62
34	63
35	67
36	71
37	72
38	73
39	74
40	75
41	79
42	82
43	83
44	86
45	89
46	90
47	94
48	96
49	97
50	99
51	101
52	103
53	105
54	106
55	107
56	109
57	113
58	117
59	118
60	120

n	a(n)
1	1
2	3
3	4
4	5
5	6
6	7
7	8
8	10
9	11
10	13
11	14
12	17
13	19
14	22
15	23
16	26
17	27
18	29
19	31
20	34
21	37
22	38
23	41
24	43
25	45
26	46
27	47
28	53
29	54
30	58
31	59
32	61
33	62
34	63
35	67
36	71
37	72
38	73
39	74
40	75
41	79
42	82
43	83
44	86
45	89
46	90
47	94
48	96
49	97
50	99
51	101
52	103
53	105
54	106
55	107
56	109
57	113
58	117
59	118
60	120

n	a(n)
1	1
2	3
3	4
4	5
5	6
6	7
7	8
8	10
9	11
10	13
11	14
12	17
13	19
14	22
15	23
16	26
17	27
18	29
19	31
20	34
21	37
22	38
23	41
24	43
25	45
26	46
27	47
28	53
29	54
30	58
31	59
32	61
33	62
34	63
35	67
36	71
37	72
38	73
39	74
40	75
41	79
42	82
43	83
44	86
45	89
46	90
47	94
48	96
49	97
50	99
51	101
52	103
53	105
54	106
55	107
56	109
57	113
58	117
59	118
60	120