A088177 - cp's OEIS frontend

A088177 a(1)=1, a(2)=1; for n>2, a(n) is the smallest positive integer such that the products a(i)*a(i+1), i=1..n-1, are all distinct.

n	a(n)
1	1
2	1
3	2
4	2
5	3
6	1
7	5
8	2
9	4
10	3
11	3
12	5
13	4
14	4
15	6
16	3
17	7
18	1
19	11
20	2
21	7
22	4
23	8
24	5
25	5
26	6
27	6
28	7
29	5
30	9
31	3
32	11
33	4
34	12
35	5
36	10
37	7
38	7
39	8
40	8
41	9
42	6
43	11
44	5
45	13
46	1
47	17
48	2
49	13
50	3
51	17
52	4
53	13
54	6
55	14
56	7
57	9
58	9
59	10
60	8
61	11
62	7
63	13
64	8
65	12
66	9
67	11
68	10
69	10
70	12
71	11
72	11
73	13
74	9
75	14
76	8
77	16
78	9

[1, 1, 2, 2, 3, 1, 5, 2, 4, 3, 3, 5, 4, 4, 6, 3, 7, 1, 11, 2, 7, 4, 8, 5, 5, 6, 6, 7, 5, 9, 3, 11, 4, 12, 5, 10, 7, 7, 8, 8, 9, 6, 11, 5, 13, 1, 17, 2, 13, 3, 17, 4, 13, 6, 14, 7, 9, 9, 10, 8, 11, 7, 13, 8, 12, 9, 11, 10, 10, 12, 11, 11, 13, 9, 14, 8, 16, 9]

cp's OEIS Frontend

A088177 a(1)=1, a(2)=1; for n>2, a(n) is the smallest positive integer such that the products a(i)*a(i+1), i=1..n-1, are all distinct.

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	2
5	3
6	1
7	5
8	2
9	4
10	3
11	3
12	5
13	4
14	4
15	6
16	3
17	7
18	1
19	11
20	2
21	7
22	4
23	8
24	5
25	5
26	6
27	6
28	7
29	5
30	9
31	3
32	11
33	4
34	12
35	5
36	10
37	7
38	7
39	8
40	8
41	9
42	6
43	11
44	5
45	13
46	1
47	17
48	2
49	13
50	3
51	17
52	4
53	13
54	6
55	14
56	7
57	9
58	9
59	10
60	8
61	11
62	7
63	13
64	8
65	12
66	9
67	11
68	10
69	10
70	12
71	11
72	11
73	13
74	9
75	14
76	8
77	16
78	9

n	a(n)
1	1
2	1
3	2
4	2
5	3
6	1
7	5
8	2
9	4
10	3
11	3
12	5
13	4
14	4
15	6
16	3
17	7
18	1
19	11
20	2
21	7
22	4
23	8
24	5
25	5
26	6
27	6
28	7
29	5
30	9
31	3
32	11
33	4
34	12
35	5
36	10
37	7
38	7
39	8
40	8
41	9
42	6
43	11
44	5
45	13
46	1
47	17
48	2
49	13
50	3
51	17
52	4
53	13
54	6
55	14
56	7
57	9
58	9
59	10
60	8
61	11
62	7
63	13
64	8
65	12
66	9
67	11
68	10
69	10
70	12
71	11
72	11
73	13
74	9
75	14
76	8
77	16
78	9

n	a(n)
1	1
2	1
3	2
4	2
5	3
6	1
7	5
8	2
9	4
10	3
11	3
12	5
13	4
14	4
15	6
16	3
17	7
18	1
19	11
20	2
21	7
22	4
23	8
24	5
25	5
26	6
27	6
28	7
29	5
30	9
31	3
32	11
33	4
34	12
35	5
36	10
37	7
38	7
39	8
40	8
41	9
42	6
43	11
44	5
45	13
46	1
47	17
48	2
49	13
50	3
51	17
52	4
53	13
54	6
55	14
56	7
57	9
58	9
59	10
60	8
61	11
62	7
63	13
64	8
65	12
66	9
67	11
68	10
69	10
70	12
71	11
72	11
73	13
74	9
75	14
76	8
77	16
78	9