A364838 - cp's OEIS frontend

A364838 a(n) is the number of line intersections (including vertices) inside a regular n-gon after inscribing (always starting from the same point), for each proper divisor d_i of n greater than 1, a regular d_i-gon.

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	7
7	7
8	8
9	9
10	11
11	11
12	21
13	13
14	15
15	19
16	16
17	17
18	26
19	19
20	31
21	25
22	23
23	23
24	53
25	25
26	27
27	27
28	39
29	29
30	73
31	31
32	32
33	37
34	35
35	43
36	86
37	37
38	39
39	43
40	79
41	41
42	91
43	43
44	55
45	69
46	47
47	47
48	121
49	49
50	62
51	55
52	63
53	53
54	87
55	63
56	99
57	61
58	59
59	59
60	253
61	61
62	63
63	91
64	64
65	73
66	123
67	67

[1, 2, 3, 4, 5, 7, 7, 8, 9, 11, 11, 21, 13, 15, 19, 16, 17, 26, 19, 31, 25, 23, 23, 53, 25, 27, 27, 39, 29, 73, 31, 32, 37, 35, 43, 86, 37, 39, 43, 79, 41, 91, 43, 55, 69, 47, 47, 121, 49, 62, 55, 63, 53, 87, 63, 99, 61, 59, 59, 253, 61, 63, 91, 64, 73, 123, 67]

cp's OEIS Frontend

A364838 a(n) is the number of line intersections (including vertices) inside a regular n-gon after inscribing (always starting from the same point), for each proper divisor d_i of n greater than 1, a regular d_i-gon.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	7
7	7
8	8
9	9
10	11
11	11
12	21
13	13
14	15
15	19
16	16
17	17
18	26
19	19
20	31
21	25
22	23
23	23
24	53
25	25
26	27
27	27
28	39
29	29
30	73
31	31
32	32
33	37
34	35
35	43
36	86
37	37
38	39
39	43
40	79
41	41
42	91
43	43
44	55
45	69
46	47
47	47
48	121
49	49
50	62
51	55
52	63
53	53
54	87
55	63
56	99
57	61
58	59
59	59
60	253
61	61
62	63
63	91
64	64
65	73
66	123
67	67

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	7
7	7
8	8
9	9
10	11
11	11
12	21
13	13
14	15
15	19
16	16
17	17
18	26
19	19
20	31
21	25
22	23
23	23
24	53
25	25
26	27
27	27
28	39
29	29
30	73
31	31
32	32
33	37
34	35
35	43
36	86
37	37
38	39
39	43
40	79
41	41
42	91
43	43
44	55
45	69
46	47
47	47
48	121
49	49
50	62
51	55
52	63
53	53
54	87
55	63
56	99
57	61
58	59
59	59
60	253
61	61
62	63
63	91
64	64
65	73
66	123
67	67

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	7
7	7
8	8
9	9
10	11
11	11
12	21
13	13
14	15
15	19
16	16
17	17
18	26
19	19
20	31
21	25
22	23
23	23
24	53
25	25
26	27
27	27
28	39
29	29
30	73
31	31
32	32
33	37
34	35
35	43
36	86
37	37
38	39
39	43
40	79
41	41
42	91
43	43
44	55
45	69
46	47
47	47
48	121
49	49
50	62
51	55
52	63
53	53
54	87
55	63
56	99
57	61
58	59
59	59
60	253
61	61
62	63
63	91
64	64
65	73
66	123
67	67