A026426 - cp's OEIS frontend

A026426 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	2
2	4
3	5
4	6
5	7
6	9
7	11
8	13
9	15
10	17
11	19
12	21
13	23
14	27
15	29
16	31
17	32
18	33
19	37
20	39
21	40
22	41
23	43
24	47
25	48
26	50
27	51
28	53
29	56
30	57
31	59
32	61
33	67
34	69
35	70
36	71
37	72
38	73
39	79
40	83
41	87
42	88
43	89
44	93
45	97
46	98
47	101
48	103
49	104
50	107
51	109
52	110
53	111
54	113
55	120
56	123
57	125
58	127

[2, 4, 5, 6, 7, 9, 11, 13, 15, 17, 19, 21, 23, 27, 29, 31, 32, 33, 37, 39, 40, 41, 43, 47, 48, 50, 51, 53, 56, 57, 59, 61, 67, 69, 70, 71, 72, 73, 79, 83, 87, 88, 89, 93, 97, 98, 101, 103, 104, 107, 109, 110, 111, 113, 120, 123, 125, 127]

cp's OEIS Frontend

A026426 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	2
2	4
3	5
4	6
5	7
6	9
7	11
8	13
9	15
10	17
11	19
12	21
13	23
14	27
15	29
16	31
17	32
18	33
19	37
20	39
21	40
22	41
23	43
24	47
25	48
26	50
27	51
28	53
29	56
30	57
31	59
32	61
33	67
34	69
35	70
36	71
37	72
38	73
39	79
40	83
41	87
42	88
43	89
44	93
45	97
46	98
47	101
48	103
49	104
50	107
51	109
52	110
53	111
54	113
55	120
56	123
57	125
58	127

n	a(n)
1	2
2	4
3	5
4	6
5	7
6	9
7	11
8	13
9	15
10	17
11	19
12	21
13	23
14	27
15	29
16	31
17	32
18	33
19	37
20	39
21	40
22	41
23	43
24	47
25	48
26	50
27	51
28	53
29	56
30	57
31	59
32	61
33	67
34	69
35	70
36	71
37	72
38	73
39	79
40	83
41	87
42	88
43	89
44	93
45	97
46	98
47	101
48	103
49	104
50	107
51	109
52	110
53	111
54	113
55	120
56	123
57	125
58	127

n	a(n)
1	2
2	4
3	5
4	6
5	7
6	9
7	11
8	13
9	15
10	17
11	19
12	21
13	23
14	27
15	29
16	31
17	32
18	33
19	37
20	39
21	40
22	41
23	43
24	47
25	48
26	50
27	51
28	53
29	56
30	57
31	59
32	61
33	67
34	69
35	70
36	71
37	72
38	73
39	79
40	83
41	87
42	88
43	89
44	93
45	97
46	98
47	101
48	103
49	104
50	107
51	109
52	110
53	111
54	113
55	120
56	123
57	125
58	127