A026442 - cp's OEIS frontend

A026442 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 3,4.

n	a(n)
1	3
2	4
3	5
4	6
5	7
6	9
7	10
8	12
9	13
10	16
11	18
12	21
13	22
14	25
15	28
16	30
17	31
18	32
19	33
20	36
21	37
22	40
23	42
24	43
25	45
26	46
27	50
28	52
29	54
30	55
31	56
32	57
33	58
34	60
35	61
36	66
37	67
38	68
39	70
40	72
41	73
42	75
43	76
44	78
45	81
46	82
47	84
48	85
49	86
50	88
51	91
52	93
53	94
54	96
55	97
56	100
57	101
58	102
59	103
60	105

[3, 4, 5, 6, 7, 9, 10, 12, 13, 16, 18, 21, 22, 25, 28, 30, 31, 32, 33, 36, 37, 40, 42, 43, 45, 46, 50, 52, 54, 55, 56, 57, 58, 60, 61, 66, 67, 68, 70, 72, 73, 75, 76, 78, 81, 82, 84, 85, 86, 88, 91, 93, 94, 96, 97, 100, 101, 102, 103, 105]

cp's OEIS Frontend

A026442 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 3,4.

Table of values

List of values

n	a(n)
1	3
2	4
3	5
4	6
5	7
6	9
7	10
8	12
9	13
10	16
11	18
12	21
13	22
14	25
15	28
16	30
17	31
18	32
19	33
20	36
21	37
22	40
23	42
24	43
25	45
26	46
27	50
28	52
29	54
30	55
31	56
32	57
33	58
34	60
35	61
36	66
37	67
38	68
39	70
40	72
41	73
42	75
43	76
44	78
45	81
46	82
47	84
48	85
49	86
50	88
51	91
52	93
53	94
54	96
55	97
56	100
57	101
58	102
59	103
60	105

n	a(n)
1	3
2	4
3	5
4	6
5	7
6	9
7	10
8	12
9	13
10	16
11	18
12	21
13	22
14	25
15	28
16	30
17	31
18	32
19	33
20	36
21	37
22	40
23	42
24	43
25	45
26	46
27	50
28	52
29	54
30	55
31	56
32	57
33	58
34	60
35	61
36	66
37	67
38	68
39	70
40	72
41	73
42	75
43	76
44	78
45	81
46	82
47	84
48	85
49	86
50	88
51	91
52	93
53	94
54	96
55	97
56	100
57	101
58	102
59	103
60	105

n	a(n)
1	3
2	4
3	5
4	6
5	7
6	9
7	10
8	12
9	13
10	16
11	18
12	21
13	22
14	25
15	28
16	30
17	31
18	32
19	33
20	36
21	37
22	40
23	42
24	43
25	45
26	46
27	50
28	52
29	54
30	55
31	56
32	57
33	58
34	60
35	61
36	66
37	67
38	68
39	70
40	72
41	73
42	75
43	76
44	78
45	81
46	82
47	84
48	85
49	86
50	88
51	91
52	93
53	94
54	96
55	97
56	100
57	101
58	102
59	103
60	105