A026421 - cp's OEIS frontend

A026421 a(n) = least positive integer > a(n-1) and not a(i)*a(j) for 1<=i with initial terms 3,4.

n	a(n)
1	3
2	4
3	5
4	6
5	7
6	8
7	9
8	10
9	11
10	13
11	14
12	16
13	17
14	19
15	22
16	23
17	25
18	26
19	29
20	31
21	34
22	37
23	38
24	41
25	43
26	46
27	47
28	49
29	53
30	58
31	59
32	61
33	62
34	67
35	71
36	73
37	74
38	79
39	81
40	82
41	83
42	86
43	89
44	94
45	97
46	101
47	103
48	105
49	106
50	107
51	108
52	109
53	113
54	118
55	120
56	121
57	122
58	127
59	131

[3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 16, 17, 19, 22, 23, 25, 26, 29, 31, 34, 37, 38, 41, 43, 46, 47, 49, 53, 58, 59, 61, 62, 67, 71, 73, 74, 79, 81, 82, 83, 86, 89, 94, 97, 101, 103, 105, 106, 107, 108, 109, 113, 118, 120, 121, 122, 127, 131]

cp's OEIS Frontend

A026421 a(n) = least positive integer > a(n-1) and not a(i)*a(j) for 1<=i with initial terms 3,4.

Table of values

List of values

n	a(n)
1	3
2	4
3	5
4	6
5	7
6	8
7	9
8	10
9	11
10	13
11	14
12	16
13	17
14	19
15	22
16	23
17	25
18	26
19	29
20	31
21	34
22	37
23	38
24	41
25	43
26	46
27	47
28	49
29	53
30	58
31	59
32	61
33	62
34	67
35	71
36	73
37	74
38	79
39	81
40	82
41	83
42	86
43	89
44	94
45	97
46	101
47	103
48	105
49	106
50	107
51	108
52	109
53	113
54	118
55	120
56	121
57	122
58	127
59	131

n	a(n)
1	3
2	4
3	5
4	6
5	7
6	8
7	9
8	10
9	11
10	13
11	14
12	16
13	17
14	19
15	22
16	23
17	25
18	26
19	29
20	31
21	34
22	37
23	38
24	41
25	43
26	46
27	47
28	49
29	53
30	58
31	59
32	61
33	62
34	67
35	71
36	73
37	74
38	79
39	81
40	82
41	83
42	86
43	89
44	94
45	97
46	101
47	103
48	105
49	106
50	107
51	108
52	109
53	113
54	118
55	120
56	121
57	122
58	127
59	131

n	a(n)
1	3
2	4
3	5
4	6
5	7
6	8
7	9
8	10
9	11
10	13
11	14
12	16
13	17
14	19
15	22
16	23
17	25
18	26
19	29
20	31
21	34
22	37
23	38
24	41
25	43
26	46
27	47
28	49
29	53
30	58
31	59
32	61
33	62
34	67
35	71
36	73
37	74
38	79
39	81
40	82
41	83
42	86
43	89
44	94
45	97
46	101
47	103
48	105
49	106
50	107
51	108
52	109
53	113
54	118
55	120
56	121
57	122
58	127
59	131