A026438 - cp's OEIS frontend

A026438 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 1,3.

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

[1, 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]

cp's OEIS Frontend

A026438 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 1,3.

Table of values

List of values

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

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

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