A081521 - cp's OEIS frontend

A081521 Triangle read by rows: row n contains n terms in increasing order, relatively prime to n, whose sum is a multiple of n and such that the row contains the smallest possible subset of consecutive numbers starting with 1.

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

[1, 1, 3, 1, 4, 7, 1, 3, 5, 7, 1, 2, 3, 6, 8, 1, 5, 7, 11, 13, 17, 1, 2, 3, 4, 5, 8, 12, 1, 3, 5, 7, 9, 11, 13, 15, 1, 2, 4, 5, 7, 8, 10, 13, 22, 1, 3, 7, 9, 11, 13, 17, 19, 21, 29, 1, 2, 3, 4, 5, 6, 7, 8, 9, 12, 20]

cp's OEIS Frontend

A081521 Triangle read by rows: row n contains n terms in increasing order, relatively prime to n, whose sum is a multiple of n and such that the row contains the smallest possible subset of consecutive numbers starting with 1.

Table of values

List of values

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

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

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