A026422 - cp's OEIS frontend

A026422 a(n) = least positive integer > a(n-1) and not a(i)*a(j) for 1 <= i <= j < n.

n	a(n)
1	1
2	2
3	3
4	5
5	7
6	8
7	11
8	12
9	13
10	17
11	18
12	19
13	20
14	23
15	27
16	28
17	29
18	30
19	31
20	32
21	37
22	41
23	42
24	43
25	44
26	45
27	47
28	48
29	50
30	52
31	53
32	59
33	61
34	63
35	66
36	67
37	68
38	70
39	71
40	72
41	73
42	75
43	76
44	78
45	79
46	80
47	83
48	89
49	92
50	97
51	98
52	99
53	101
54	102
55	103
56	105
57	107
58	108
59	109
60	110

[1, 2, 3, 5, 7, 8, 11, 12, 13, 17, 18, 19, 20, 23, 27, 28, 29, 30, 31, 32, 37, 41, 42, 43, 44, 45, 47, 48, 50, 52, 53, 59, 61, 63, 66, 67, 68, 70, 71, 72, 73, 75, 76, 78, 79, 80, 83, 89, 92, 97, 98, 99, 101, 102, 103, 105, 107, 108, 109, 110]

cp's OEIS Frontend

A026422 a(n) = least positive integer > a(n-1) and not a(i)*a(j) for 1 <= i <= j < n.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	5
5	7
6	8
7	11
8	12
9	13
10	17
11	18
12	19
13	20
14	23
15	27
16	28
17	29
18	30
19	31
20	32
21	37
22	41
23	42
24	43
25	44
26	45
27	47
28	48
29	50
30	52
31	53
32	59
33	61
34	63
35	66
36	67
37	68
38	70
39	71
40	72
41	73
42	75
43	76
44	78
45	79
46	80
47	83
48	89
49	92
50	97
51	98
52	99
53	101
54	102
55	103
56	105
57	107
58	108
59	109
60	110

n	a(n)
1	1
2	2
3	3
4	5
5	7
6	8
7	11
8	12
9	13
10	17
11	18
12	19
13	20
14	23
15	27
16	28
17	29
18	30
19	31
20	32
21	37
22	41
23	42
24	43
25	44
26	45
27	47
28	48
29	50
30	52
31	53
32	59
33	61
34	63
35	66
36	67
37	68
38	70
39	71
40	72
41	73
42	75
43	76
44	78
45	79
46	80
47	83
48	89
49	92
50	97
51	98
52	99
53	101
54	102
55	103
56	105
57	107
58	108
59	109
60	110

n	a(n)
1	1
2	2
3	3
4	5
5	7
6	8
7	11
8	12
9	13
10	17
11	18
12	19
13	20
14	23
15	27
16	28
17	29
18	30
19	31
20	32
21	37
22	41
23	42
24	43
25	44
26	45
27	47
28	48
29	50
30	52
31	53
32	59
33	61
34	63
35	66
36	67
37	68
38	70
39	71
40	72
41	73
42	75
43	76
44	78
45	79
46	80
47	83
48	89
49	92
50	97
51	98
52	99
53	101
54	102
55	103
56	105
57	107
58	108
59	109
60	110