A026434 - cp's OEIS frontend

A026434 a(n) = least positive integer > a(n-1) and not a(i)*a(j)-1 for 1<=i with initial terms 1,4.

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	16
15	17
16	18
17	20
18	21
19	22
20	24
21	25
22	26
23	28
24	30
25	32
26	33
27	36
28	37
29	38
30	40
31	42
32	45
33	46
34	48
35	50
36	52
37	56
38	57
39	58
40	60
41	61
42	66
43	68
44	70
45	72
46	73
47	75
48	78
49	80
50	81
51	82
52	85
53	86
54	88
55	91
56	92
57	93
58	94
59	96
60	100

[1, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20, 21, 22, 24, 25, 26, 28, 30, 32, 33, 36, 37, 38, 40, 42, 45, 46, 48, 50, 52, 56, 57, 58, 60, 61, 66, 68, 70, 72, 73, 75, 78, 80, 81, 82, 85, 86, 88, 91, 92, 93, 94, 96, 100]

cp's OEIS Frontend

A026434 a(n) = least positive integer > a(n-1) and not a(i)*a(j)-1 for 1<=i with initial terms 1,4.

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	16
15	17
16	18
17	20
18	21
19	22
20	24
21	25
22	26
23	28
24	30
25	32
26	33
27	36
28	37
29	38
30	40
31	42
32	45
33	46
34	48
35	50
36	52
37	56
38	57
39	58
40	60
41	61
42	66
43	68
44	70
45	72
46	73
47	75
48	78
49	80
50	81
51	82
52	85
53	86
54	88
55	91
56	92
57	93
58	94
59	96
60	100

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	16
15	17
16	18
17	20
18	21
19	22
20	24
21	25
22	26
23	28
24	30
25	32
26	33
27	36
28	37
29	38
30	40
31	42
32	45
33	46
34	48
35	50
36	52
37	56
38	57
39	58
40	60
41	61
42	66
43	68
44	70
45	72
46	73
47	75
48	78
49	80
50	81
51	82
52	85
53	86
54	88
55	91
56	92
57	93
58	94
59	96
60	100

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	16
15	17
16	18
17	20
18	21
19	22
20	24
21	25
22	26
23	28
24	30
25	32
26	33
27	36
28	37
29	38
30	40
31	42
32	45
33	46
34	48
35	50
36	52
37	56
38	57
39	58
40	60
41	61
42	66
43	68
44	70
45	72
46	73
47	75
48	78
49	80
50	81
51	82
52	85
53	86
54	88
55	91
56	92
57	93
58	94
59	96
60	100