A026441 - cp's OEIS frontend

A026441 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 2,4.

n	a(n)
1	2
2	4
3	5
4	6
5	8
6	10
7	12
8	13
9	14
10	16
11	17
12	18
13	20
14	21
15	22
16	26
17	28
18	30
19	32
20	34
21	36
22	37
23	38
24	40
25	42
26	44
27	45
28	46
29	48
30	50
31	52
32	53
33	54
34	56
35	57
36	58
37	60
38	61
39	62
40	65
41	66
42	68
43	70
44	72
45	74
46	76
47	78
48	80
49	81
50	82
51	85
52	86
53	88
54	90
55	92
56	93
57	94
58	96
59	97
60	98

[2, 4, 5, 6, 8, 10, 12, 13, 14, 16, 17, 18, 20, 21, 22, 26, 28, 30, 32, 34, 36, 37, 38, 40, 42, 44, 45, 46, 48, 50, 52, 53, 54, 56, 57, 58, 60, 61, 62, 65, 66, 68, 70, 72, 74, 76, 78, 80, 81, 82, 85, 86, 88, 90, 92, 93, 94, 96, 97, 98]

cp's OEIS Frontend

A026441 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 2,4.

Table of values

List of values

n	a(n)
1	2
2	4
3	5
4	6
5	8
6	10
7	12
8	13
9	14
10	16
11	17
12	18
13	20
14	21
15	22
16	26
17	28
18	30
19	32
20	34
21	36
22	37
23	38
24	40
25	42
26	44
27	45
28	46
29	48
30	50
31	52
32	53
33	54
34	56
35	57
36	58
37	60
38	61
39	62
40	65
41	66
42	68
43	70
44	72
45	74
46	76
47	78
48	80
49	81
50	82
51	85
52	86
53	88
54	90
55	92
56	93
57	94
58	96
59	97
60	98

n	a(n)
1	2
2	4
3	5
4	6
5	8
6	10
7	12
8	13
9	14
10	16
11	17
12	18
13	20
14	21
15	22
16	26
17	28
18	30
19	32
20	34
21	36
22	37
23	38
24	40
25	42
26	44
27	45
28	46
29	48
30	50
31	52
32	53
33	54
34	56
35	57
36	58
37	60
38	61
39	62
40	65
41	66
42	68
43	70
44	72
45	74
46	76
47	78
48	80
49	81
50	82
51	85
52	86
53	88
54	90
55	92
56	93
57	94
58	96
59	97
60	98

n	a(n)
1	2
2	4
3	5
4	6
5	8
6	10
7	12
8	13
9	14
10	16
11	17
12	18
13	20
14	21
15	22
16	26
17	28
18	30
19	32
20	34
21	36
22	37
23	38
24	40
25	42
26	44
27	45
28	46
29	48
30	50
31	52
32	53
33	54
34	56
35	57
36	58
37	60
38	61
39	62
40	65
41	66
42	68
43	70
44	72
45	74
46	76
47	78
48	80
49	81
50	82
51	85
52	86
53	88
54	90
55	92
56	93
57	94
58	96
59	97
60	98