A026419 - cp's OEIS frontend

A026419 a(n) = least positive integer > a(n-1) and not a(i)*a(j) 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	19
18	21
19	22
20	23
21	25
22	26
23	27
24	29
25	31
26	33
27	34
28	37
29	38
30	39
31	41
32	43
33	46
34	47
35	49
36	51
37	53
38	57
39	58
40	59
41	61
42	62
43	67
44	69
45	71
46	73
47	74
48	79
49	81
50	82
51	83
52	86
53	87
54	89
55	93
56	94
57	97
58	101
59	103
60	106

[1, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 22, 23, 25, 26, 27, 29, 31, 33, 34, 37, 38, 39, 41, 43, 46, 47, 49, 51, 53, 57, 58, 59, 61, 62, 67, 69, 71, 73, 74, 79, 81, 82, 83, 86, 87, 89, 93, 94, 97, 101, 103, 106]

cp's OEIS Frontend

A026419 a(n) = least positive integer > a(n-1) and not a(i)*a(j) 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	19
18	21
19	22
20	23
21	25
22	26
23	27
24	29
25	31
26	33
27	34
28	37
29	38
30	39
31	41
32	43
33	46
34	47
35	49
36	51
37	53
38	57
39	58
40	59
41	61
42	62
43	67
44	69
45	71
46	73
47	74
48	79
49	81
50	82
51	83
52	86
53	87
54	89
55	93
56	94
57	97
58	101
59	103
60	106

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	19
18	21
19	22
20	23
21	25
22	26
23	27
24	29
25	31
26	33
27	34
28	37
29	38
30	39
31	41
32	43
33	46
34	47
35	49
36	51
37	53
38	57
39	58
40	59
41	61
42	62
43	67
44	69
45	71
46	73
47	74
48	79
49	81
50	82
51	83
52	86
53	87
54	89
55	93
56	94
57	97
58	101
59	103
60	106

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	19
18	21
19	22
20	23
21	25
22	26
23	27
24	29
25	31
26	33
27	34
28	37
29	38
30	39
31	41
32	43
33	46
34	47
35	49
36	51
37	53
38	57
39	58
40	59
41	61
42	62
43	67
44	69
45	71
46	73
47	74
48	79
49	81
50	82
51	83
52	86
53	87
54	89
55	93
56	94
57	97
58	101
59	103
60	106