A026480 - cp's OEIS frontend

A026480 a(1) = 1, a(2) = 2, a(3) = 4, and for n > 3, a(n) is the least positive integer > a(n-1) not of form a(i)a(j)a(k) for 1 <= i <= j <= k < n.

n	a(n)
1	1
2	2
3	4
4	5
5	6
6	7
7	9
8	11
9	13
10	15
11	17
12	19
13	21
14	23
15	27
16	29
17	31
18	33
19	37
20	39
21	41
22	43
23	47
24	51
25	53
26	57
27	59
28	61
29	67
30	69
31	71
32	73
33	79
34	83
35	87
36	89
37	93
38	97
39	101
40	103
41	107
42	109
43	111
44	113
45	123
46	127
47	128
48	129
49	131
50	137
51	139
52	141
53	149
54	151
55	157
56	159
57	160
58	163
59	167
60	173
61	177
62	179
63	181

[1, 2, 4, 5, 6, 7, 9, 11, 13, 15, 17, 19, 21, 23, 27, 29, 31, 33, 37, 39, 41, 43, 47, 51, 53, 57, 59, 61, 67, 69, 71, 73, 79, 83, 87, 89, 93, 97, 101, 103, 107, 109, 111, 113, 123, 127, 128, 129, 131, 137, 139, 141, 149, 151, 157, 159, 160, 163, 167, 173, 177, 179, 181]

cp's OEIS Frontend

A026480 a(1) = 1, a(2) = 2, a(3) = 4, and for n > 3, a(n) is the least positive integer > a(n-1) not of form a(i)a(j)a(k) for 1 <= i <= j <= k < n.

Table of values

List of values

n	a(n)
1	1
2	2
3	4
4	5
5	6
6	7
7	9
8	11
9	13
10	15
11	17
12	19
13	21
14	23
15	27
16	29
17	31
18	33
19	37
20	39
21	41
22	43
23	47
24	51
25	53
26	57
27	59
28	61
29	67
30	69
31	71
32	73
33	79
34	83
35	87
36	89
37	93
38	97
39	101
40	103
41	107
42	109
43	111
44	113
45	123
46	127
47	128
48	129
49	131
50	137
51	139
52	141
53	149
54	151
55	157
56	159
57	160
58	163
59	167
60	173
61	177
62	179
63	181

n	a(n)
1	1
2	2
3	4
4	5
5	6
6	7
7	9
8	11
9	13
10	15
11	17
12	19
13	21
14	23
15	27
16	29
17	31
18	33
19	37
20	39
21	41
22	43
23	47
24	51
25	53
26	57
27	59
28	61
29	67
30	69
31	71
32	73
33	79
34	83
35	87
36	89
37	93
38	97
39	101
40	103
41	107
42	109
43	111
44	113
45	123
46	127
47	128
48	129
49	131
50	137
51	139
52	141
53	149
54	151
55	157
56	159
57	160
58	163
59	167
60	173
61	177
62	179
63	181

cp's OEIS Frontend

A026480 a(1) = 1, a(2) = 2, a(3) = 4, and for n > 3, a(n) is the least positive integer > a(n-1) not of form a(i)*a(j)*a(k) for 1 <= i <= j <= k < n.

Table of values

List of values

A026480 a(1) = 1, a(2) = 2, a(3) = 4, and for n > 3, a(n) is the least positive integer > a(n-1) not of form a(i)a(j)a(k) for 1 <= i <= j <= k < n.

n	a(n)
1	1
2	2
3	4
4	5
5	6
6	7
7	9
8	11
9	13
10	15
11	17
12	19
13	21
14	23
15	27
16	29
17	31
18	33
19	37
20	39
21	41
22	43
23	47
24	51
25	53
26	57
27	59
28	61
29	67
30	69
31	71
32	73
33	79
34	83
35	87
36	89
37	93
38	97
39	101
40	103
41	107
42	109
43	111
44	113
45	123
46	127
47	128
48	129
49	131
50	137
51	139
52	141
53	149
54	151
55	157
56	159
57	160
58	163
59	167
60	173
61	177
62	179
63	181