A026425 - cp's OEIS frontend

A026425 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	4
3	5
4	6
5	7
6	8
7	9
8	10
9	11
10	12
11	13
12	14
13	15
14	17
15	18
16	19
17	21
18	22
19	23
20	26
21	27
22	29
23	31
24	33
25	34
26	37
27	38
28	39
29	41
30	43
31	46
32	47
33	51
34	53
35	57
36	58
37	59
38	61
39	62
40	67
41	69
42	71
43	73
44	74
45	79
46	82
47	83
48	86
49	87
50	89
51	93
52	94
53	97
54	101
55	103
56	106
57	107
58	109
59	111
60	113

[1, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19, 21, 22, 23, 26, 27, 29, 31, 33, 34, 37, 38, 39, 41, 43, 46, 47, 51, 53, 57, 58, 59, 61, 62, 67, 69, 71, 73, 74, 79, 82, 83, 86, 87, 89, 93, 94, 97, 101, 103, 106, 107, 109, 111, 113]

cp's OEIS Frontend

A026425 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	4
3	5
4	6
5	7
6	8
7	9
8	10
9	11
10	12
11	13
12	14
13	15
14	17
15	18
16	19
17	21
18	22
19	23
20	26
21	27
22	29
23	31
24	33
25	34
26	37
27	38
28	39
29	41
30	43
31	46
32	47
33	51
34	53
35	57
36	58
37	59
38	61
39	62
40	67
41	69
42	71
43	73
44	74
45	79
46	82
47	83
48	86
49	87
50	89
51	93
52	94
53	97
54	101
55	103
56	106
57	107
58	109
59	111
60	113

n	a(n)
1	1
2	4
3	5
4	6
5	7
6	8
7	9
8	10
9	11
10	12
11	13
12	14
13	15
14	17
15	18
16	19
17	21
18	22
19	23
20	26
21	27
22	29
23	31
24	33
25	34
26	37
27	38
28	39
29	41
30	43
31	46
32	47
33	51
34	53
35	57
36	58
37	59
38	61
39	62
40	67
41	69
42	71
43	73
44	74
45	79
46	82
47	83
48	86
49	87
50	89
51	93
52	94
53	97
54	101
55	103
56	106
57	107
58	109
59	111
60	113

n	a(n)
1	1
2	4
3	5
4	6
5	7
6	8
7	9
8	10
9	11
10	12
11	13
12	14
13	15
14	17
15	18
16	19
17	21
18	22
19	23
20	26
21	27
22	29
23	31
24	33
25	34
26	37
27	38
28	39
29	41
30	43
31	46
32	47
33	51
34	53
35	57
36	58
37	59
38	61
39	62
40	67
41	69
42	71
43	73
44	74
45	79
46	82
47	83
48	86
49	87
50	89
51	93
52	94
53	97
54	101
55	103
56	106
57	107
58	109
59	111
60	113