A026420 - cp's OEIS frontend

A026420 a(n) = least positive integer > a(n-1) and not a(i)*a(j) for 1<=i with initial terms 2,4.

n	a(n)
1	2
2	4
3	5
4	6
5	7
6	9
7	11
8	13
9	15
10	16
11	17
12	19
13	21
14	23
15	25
16	27
17	29
18	31
19	33
20	37
21	39
22	40
23	41
24	43
25	47
26	48
27	49
28	51
29	53
30	56
31	57
32	59
33	61
34	67
35	69
36	70
37	71
38	72
39	73
40	79
41	81
42	83
43	87
44	88
45	89
46	93
47	97
48	101
49	103
50	104
51	107
52	109
53	110
54	111
55	113
56	120
57	121
58	123
59	127

[2, 4, 5, 6, 7, 9, 11, 13, 15, 16, 17, 19, 21, 23, 25, 27, 29, 31, 33, 37, 39, 40, 41, 43, 47, 48, 49, 51, 53, 56, 57, 59, 61, 67, 69, 70, 71, 72, 73, 79, 81, 83, 87, 88, 89, 93, 97, 101, 103, 104, 107, 109, 110, 111, 113, 120, 121, 123, 127]

cp's OEIS Frontend

A026420 a(n) = least positive integer > a(n-1) and not a(i)*a(j) for 1<=i with initial terms 2,4.

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	16
11	17
12	19
13	21
14	23
15	25
16	27
17	29
18	31
19	33
20	37
21	39
22	40
23	41
24	43
25	47
26	48
27	49
28	51
29	53
30	56
31	57
32	59
33	61
34	67
35	69
36	70
37	71
38	72
39	73
40	79
41	81
42	83
43	87
44	88
45	89
46	93
47	97
48	101
49	103
50	104
51	107
52	109
53	110
54	111
55	113
56	120
57	121
58	123
59	127

n	a(n)
1	2
2	4
3	5
4	6
5	7
6	9
7	11
8	13
9	15
10	16
11	17
12	19
13	21
14	23
15	25
16	27
17	29
18	31
19	33
20	37
21	39
22	40
23	41
24	43
25	47
26	48
27	49
28	51
29	53
30	56
31	57
32	59
33	61
34	67
35	69
36	70
37	71
38	72
39	73
40	79
41	81
42	83
43	87
44	88
45	89
46	93
47	97
48	101
49	103
50	104
51	107
52	109
53	110
54	111
55	113
56	120
57	121
58	123
59	127

n	a(n)
1	2
2	4
3	5
4	6
5	7
6	9
7	11
8	13
9	15
10	16
11	17
12	19
13	21
14	23
15	25
16	27
17	29
18	31
19	33
20	37
21	39
22	40
23	41
24	43
25	47
26	48
27	49
28	51
29	53
30	56
31	57
32	59
33	61
34	67
35	69
36	70
37	71
38	72
39	73
40	79
41	81
42	83
43	87
44	88
45	89
46	93
47	97
48	101
49	103
50	104
51	107
52	109
53	110
54	111
55	113
56	120
57	121
58	123
59	127