A026439 - cp's OEIS frontend

A026439 a(n) = least positive integer > a(n-1) and not a(i)*a(j)-1 for 1 <= i <= j < n, n >= 2, with initial terms 2,3.

n	a(n)
1	2
2	3
3	4
4	6
5	9
6	10
7	12
8	13
9	14
10	16
11	18
12	20
13	21
14	22
15	24
16	28
17	30
18	32
19	33
20	34
21	36
22	37
23	40
24	42
25	44
26	45
27	46
28	48
29	49
30	50
31	52
32	54
33	56
34	57
35	58
36	60
37	61
38	64
39	66
40	68
41	69
42	70
43	72
44	74
45	75
46	76
47	78
48	81
49	82
50	84
51	85
52	86
53	88
54	90
55	92
56	93
57	94
58	96
59	100
60	102

[2, 3, 4, 6, 9, 10, 12, 13, 14, 16, 18, 20, 21, 22, 24, 28, 30, 32, 33, 34, 36, 37, 40, 42, 44, 45, 46, 48, 49, 50, 52, 54, 56, 57, 58, 60, 61, 64, 66, 68, 69, 70, 72, 74, 75, 76, 78, 81, 82, 84, 85, 86, 88, 90, 92, 93, 94, 96, 100, 102]

cp's OEIS Frontend

A026439 a(n) = least positive integer > a(n-1) and not a(i)*a(j)-1 for 1 <= i <= j < n, n >= 2, with initial terms 2,3.

Table of values

List of values

n	a(n)
1	2
2	3
3	4
4	6
5	9
6	10
7	12
8	13
9	14
10	16
11	18
12	20
13	21
14	22
15	24
16	28
17	30
18	32
19	33
20	34
21	36
22	37
23	40
24	42
25	44
26	45
27	46
28	48
29	49
30	50
31	52
32	54
33	56
34	57
35	58
36	60
37	61
38	64
39	66
40	68
41	69
42	70
43	72
44	74
45	75
46	76
47	78
48	81
49	82
50	84
51	85
52	86
53	88
54	90
55	92
56	93
57	94
58	96
59	100
60	102

n	a(n)
1	2
2	3
3	4
4	6
5	9
6	10
7	12
8	13
9	14
10	16
11	18
12	20
13	21
14	22
15	24
16	28
17	30
18	32
19	33
20	34
21	36
22	37
23	40
24	42
25	44
26	45
27	46
28	48
29	49
30	50
31	52
32	54
33	56
34	57
35	58
36	60
37	61
38	64
39	66
40	68
41	69
42	70
43	72
44	74
45	75
46	76
47	78
48	81
49	82
50	84
51	85
52	86
53	88
54	90
55	92
56	93
57	94
58	96
59	100
60	102

n	a(n)
1	2
2	3
3	4
4	6
5	9
6	10
7	12
8	13
9	14
10	16
11	18
12	20
13	21
14	22
15	24
16	28
17	30
18	32
19	33
20	34
21	36
22	37
23	40
24	42
25	44
26	45
27	46
28	48
29	49
30	50
31	52
32	54
33	56
34	57
35	58
36	60
37	61
38	64
39	66
40	68
41	69
42	70
43	72
44	74
45	75
46	76
47	78
48	81
49	82
50	84
51	85
52	86
53	88
54	90
55	92
56	93
57	94
58	96
59	100
60	102