A026435 - cp's OEIS frontend

A026435 a(n) = least positive integer > a(n-1) and not a(i)*a(j)-1 for 1<=i 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	24
17	26
18	28
19	30
20	32
21	34
22	36
23	37
24	38
25	40
26	42
27	44
28	45
29	46
30	48
31	50
32	52
33	53
34	54
35	56
36	57
37	58
38	60
39	61
40	62
41	65
42	66
43	68
44	70
45	72
46	74
47	76
48	78
49	80
50	81
51	82
52	85
53	86
54	88
55	90
56	92
57	93
58	94
59	96
60	97

[2, 4, 5, 6, 8, 10, 12, 13, 14, 16, 17, 18, 20, 21, 22, 24, 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]

cp's OEIS Frontend

A026435 a(n) = least positive integer > a(n-1) and not a(i)*a(j)-1 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	8
6	10
7	12
8	13
9	14
10	16
11	17
12	18
13	20
14	21
15	22
16	24
17	26
18	28
19	30
20	32
21	34
22	36
23	37
24	38
25	40
26	42
27	44
28	45
29	46
30	48
31	50
32	52
33	53
34	54
35	56
36	57
37	58
38	60
39	61
40	62
41	65
42	66
43	68
44	70
45	72
46	74
47	76
48	78
49	80
50	81
51	82
52	85
53	86
54	88
55	90
56	92
57	93
58	94
59	96
60	97

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	24
17	26
18	28
19	30
20	32
21	34
22	36
23	37
24	38
25	40
26	42
27	44
28	45
29	46
30	48
31	50
32	52
33	53
34	54
35	56
36	57
37	58
38	60
39	61
40	62
41	65
42	66
43	68
44	70
45	72
46	74
47	76
48	78
49	80
50	81
51	82
52	85
53	86
54	88
55	90
56	92
57	93
58	94
59	96
60	97

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	24
17	26
18	28
19	30
20	32
21	34
22	36
23	37
24	38
25	40
26	42
27	44
28	45
29	46
30	48
31	50
32	52
33	53
34	54
35	56
36	57
37	58
38	60
39	61
40	62
41	65
42	66
43	68
44	70
45	72
46	74
47	76
48	78
49	80
50	81
51	82
52	85
53	86
54	88
55	90
56	92
57	93
58	94
59	96
60	97