A023987 - cp's OEIS frontend

A023987 Sum of exponents of primes in C(5n,3n) - sum of exponents of primes in C(3n,2n).

n	a(n)
0	0
1	1
2	2
3	0
4	2
5	4
6	2
7	3
8	5
9	4
10	5
11	2
12	2
13	7
14	5
15	5
16	7
17	7
18	7
19	3
20	9
21	11
22	3
23	5
24	6
25	8
26	11
27	7
28	9
29	12
30	10
31	10
32	10
33	12
34	11
35	10
36	13
37	14
38	13
39	13
40	14
41	15
42	14
43	5
44	8
45	11
46	8
47	9
48	9
49	12
50	14
51	13
52	16
53	20
54	12
55	14
56	17
57	14
58	19
59	12
60	17
61	19
62	17
63	15
64	15
65	21
66	20
67	16
68	19
69	23
70	16
71	21
72	21
73	23
74	22
75	17
76	22
77	26
78	24
79	24
80	26
81	26
82	24
83	22
84	23

[0, 1, 2, 0, 2, 4, 2, 3, 5, 4, 5, 2, 2, 7, 5, 5, 7, 7, 7, 3, 9, 11, 3, 5, 6, 8, 11, 7, 9, 12, 10, 10, 10, 12, 11, 10, 13, 14, 13, 13, 14, 15, 14, 5, 8, 11, 8, 9, 9, 12, 14, 13, 16, 20, 12, 14, 17, 14, 19, 12, 17, 19, 17, 15, 15, 21, 20, 16, 19, 23, 16, 21, 21, 23, 22, 17, 22, 26, 24, 24, 26, 26, 24, 22, 23]

cp's OEIS Frontend

A023987 Sum of exponents of primes in C(5n,3n) - sum of exponents of primes in C(3n,2n).

Table of values

List of values

n	a(n)
0	0
1	1
2	2
3	0
4	2
5	4
6	2
7	3
8	5
9	4
10	5
11	2
12	2
13	7
14	5
15	5
16	7
17	7
18	7
19	3
20	9
21	11
22	3
23	5
24	6
25	8
26	11
27	7
28	9
29	12
30	10
31	10
32	10
33	12
34	11
35	10
36	13
37	14
38	13
39	13
40	14
41	15
42	14
43	5
44	8
45	11
46	8
47	9
48	9
49	12
50	14
51	13
52	16
53	20
54	12
55	14
56	17
57	14
58	19
59	12
60	17
61	19
62	17
63	15
64	15
65	21
66	20
67	16
68	19
69	23
70	16
71	21
72	21
73	23
74	22
75	17
76	22
77	26
78	24
79	24
80	26
81	26
82	24
83	22
84	23

n	a(n)
0	0
1	1
2	2
3	0
4	2
5	4
6	2
7	3
8	5
9	4
10	5
11	2
12	2
13	7
14	5
15	5
16	7
17	7
18	7
19	3
20	9
21	11
22	3
23	5
24	6
25	8
26	11
27	7
28	9
29	12
30	10
31	10
32	10
33	12
34	11
35	10
36	13
37	14
38	13
39	13
40	14
41	15
42	14
43	5
44	8
45	11
46	8
47	9
48	9
49	12
50	14
51	13
52	16
53	20
54	12
55	14
56	17
57	14
58	19
59	12
60	17
61	19
62	17
63	15
64	15
65	21
66	20
67	16
68	19
69	23
70	16
71	21
72	21
73	23
74	22
75	17
76	22
77	26
78	24
79	24
80	26
81	26
82	24
83	22
84	23

n	a(n)
0	0
1	1
2	2
3	0
4	2
5	4
6	2
7	3
8	5
9	4
10	5
11	2
12	2
13	7
14	5
15	5
16	7
17	7
18	7
19	3
20	9
21	11
22	3
23	5
24	6
25	8
26	11
27	7
28	9
29	12
30	10
31	10
32	10
33	12
34	11
35	10
36	13
37	14
38	13
39	13
40	14
41	15
42	14
43	5
44	8
45	11
46	8
47	9
48	9
49	12
50	14
51	13
52	16
53	20
54	12
55	14
56	17
57	14
58	19
59	12
60	17
61	19
62	17
63	15
64	15
65	21
66	20
67	16
68	19
69	23
70	16
71	21
72	21
73	23
74	22
75	17
76	22
77	26
78	24
79	24
80	26
81	26
82	24
83	22
84	23