A070091 - cp's OEIS frontend

A070091 Number of isosceles integer triangles with perimeter n and relatively prime side lengths.

n	a(n)
1	0
2	0
3	1
4	0
5	1
6	0
7	2
8	1
9	1
10	1
11	3
12	1
13	3
14	1
15	2
16	2
17	4
18	2
19	5
20	2
21	2
22	2
23	6
24	2
25	5
26	3
27	5
28	3
29	7
30	2
31	8
32	4
33	4
34	4
35	6
36	3
37	9
38	4
39	6
40	4
41	10
42	4
43	11
44	5
45	6
46	5
47	12
48	4
49	10
50	5
51	8
52	6
53	13
54	4
55	10
56	6
57	8
58	7
59	15
60	4
61	15
62	7
63	10
64	8
65	12
66	6
67	17
68	8
69	10
70	6
71	18
72	6
73	18
74	9
75	10
76	9
77	14
78	6
79	20
80	8
81	13

[0, 0, 1, 0, 1, 0, 2, 1, 1, 1, 3, 1, 3, 1, 2, 2, 4, 2, 5, 2, 2, 2, 6, 2, 5, 3, 5, 3, 7, 2, 8, 4, 4, 4, 6, 3, 9, 4, 6, 4, 10, 4, 11, 5, 6, 5, 12, 4, 10, 5, 8, 6, 13, 4, 10, 6, 8, 7, 15, 4, 15, 7, 10, 8, 12, 6, 17, 8, 10, 6, 18, 6, 18, 9, 10, 9, 14, 6, 20, 8, 13]

cp's OEIS Frontend

A070091 Number of isosceles integer triangles with perimeter n and relatively prime side lengths.

Table of values

List of values

n	a(n)
1	0
2	0
3	1
4	0
5	1
6	0
7	2
8	1
9	1
10	1
11	3
12	1
13	3
14	1
15	2
16	2
17	4
18	2
19	5
20	2
21	2
22	2
23	6
24	2
25	5
26	3
27	5
28	3
29	7
30	2
31	8
32	4
33	4
34	4
35	6
36	3
37	9
38	4
39	6
40	4
41	10
42	4
43	11
44	5
45	6
46	5
47	12
48	4
49	10
50	5
51	8
52	6
53	13
54	4
55	10
56	6
57	8
58	7
59	15
60	4
61	15
62	7
63	10
64	8
65	12
66	6
67	17
68	8
69	10
70	6
71	18
72	6
73	18
74	9
75	10
76	9
77	14
78	6
79	20
80	8
81	13

n	a(n)
1	0
2	0
3	1
4	0
5	1
6	0
7	2
8	1
9	1
10	1
11	3
12	1
13	3
14	1
15	2
16	2
17	4
18	2
19	5
20	2
21	2
22	2
23	6
24	2
25	5
26	3
27	5
28	3
29	7
30	2
31	8
32	4
33	4
34	4
35	6
36	3
37	9
38	4
39	6
40	4
41	10
42	4
43	11
44	5
45	6
46	5
47	12
48	4
49	10
50	5
51	8
52	6
53	13
54	4
55	10
56	6
57	8
58	7
59	15
60	4
61	15
62	7
63	10
64	8
65	12
66	6
67	17
68	8
69	10
70	6
71	18
72	6
73	18
74	9
75	10
76	9
77	14
78	6
79	20
80	8
81	13

n	a(n)
1	0
2	0
3	1
4	0
5	1
6	0
7	2
8	1
9	1
10	1
11	3
12	1
13	3
14	1
15	2
16	2
17	4
18	2
19	5
20	2
21	2
22	2
23	6
24	2
25	5
26	3
27	5
28	3
29	7
30	2
31	8
32	4
33	4
34	4
35	6
36	3
37	9
38	4
39	6
40	4
41	10
42	4
43	11
44	5
45	6
46	5
47	12
48	4
49	10
50	5
51	8
52	6
53	13
54	4
55	10
56	6
57	8
58	7
59	15
60	4
61	15
62	7
63	10
64	8
65	12
66	6
67	17
68	8
69	10
70	6
71	18
72	6
73	18
74	9
75	10
76	9
77	14
78	6
79	20
80	8
81	13