A026432 - cp's OEIS frontend

A026432 a(n) = least positive integer > a(n-1) and not a(i)*a(j)-1 for 1<=i with initial terms 1,3.

n	a(n)
1	1
2	3
3	4
4	5
5	6
6	7
7	8
8	9
9	10
10	12
11	13
12	15
13	16
14	18
15	21
16	22
17	24
18	25
19	28
20	30
21	32
22	33
23	36
24	37
25	40
26	42
27	43
28	45
29	46
30	48
31	50
32	52
33	54
34	56
35	57
36	58
37	60
38	61
39	66
40	67
41	68
42	70
43	72
44	73
45	75
46	76
47	78
48	80
49	81
50	82
51	84
52	85
53	86
54	88
55	91
56	92
57	93
58	94
59	96
60	97

[1, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 15, 16, 18, 21, 22, 24, 25, 28, 30, 32, 33, 36, 37, 40, 42, 43, 45, 46, 48, 50, 52, 54, 56, 57, 58, 60, 61, 66, 67, 68, 70, 72, 73, 75, 76, 78, 80, 81, 82, 84, 85, 86, 88, 91, 92, 93, 94, 96, 97]

cp's OEIS Frontend

A026432 a(n) = least positive integer > a(n-1) and not a(i)*a(j)-1 for 1<=i with initial terms 1,3.

Table of values

List of values

n	a(n)
1	1
2	3
3	4
4	5
5	6
6	7
7	8
8	9
9	10
10	12
11	13
12	15
13	16
14	18
15	21
16	22
17	24
18	25
19	28
20	30
21	32
22	33
23	36
24	37
25	40
26	42
27	43
28	45
29	46
30	48
31	50
32	52
33	54
34	56
35	57
36	58
37	60
38	61
39	66
40	67
41	68
42	70
43	72
44	73
45	75
46	76
47	78
48	80
49	81
50	82
51	84
52	85
53	86
54	88
55	91
56	92
57	93
58	94
59	96
60	97

n	a(n)
1	1
2	3
3	4
4	5
5	6
6	7
7	8
8	9
9	10
10	12
11	13
12	15
13	16
14	18
15	21
16	22
17	24
18	25
19	28
20	30
21	32
22	33
23	36
24	37
25	40
26	42
27	43
28	45
29	46
30	48
31	50
32	52
33	54
34	56
35	57
36	58
37	60
38	61
39	66
40	67
41	68
42	70
43	72
44	73
45	75
46	76
47	78
48	80
49	81
50	82
51	84
52	85
53	86
54	88
55	91
56	92
57	93
58	94
59	96
60	97

n	a(n)
1	1
2	3
3	4
4	5
5	6
6	7
7	8
8	9
9	10
10	12
11	13
12	15
13	16
14	18
15	21
16	22
17	24
18	25
19	28
20	30
21	32
22	33
23	36
24	37
25	40
26	42
27	43
28	45
29	46
30	48
31	50
32	52
33	54
34	56
35	57
36	58
37	60
38	61
39	66
40	67
41	68
42	70
43	72
44	73
45	75
46	76
47	78
48	80
49	81
50	82
51	84
52	85
53	86
54	88
55	91
56	92
57	93
58	94
59	96
60	97