A020731 - cp's OEIS frontend

A020731 Numbers n for which number of distinct prime divisors of C(n,k) has maximum at k = [n/2].

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	11
11	12
12	13
13	14
14	15
15	16
16	17
17	18
18	19
19	21
20	22
21	23
22	24
23	25
24	26
25	30
26	31
27	32
28	33
29	35
30	36
31	37
32	39
33	40
34	41
35	42
36	43
37	47
38	48
39	49
40	50
41	55
42	56
43	57
44	58
45	63
46	64
47	65
48	66
49	67
50	68
51	71
52	72
53	73
54	75
55	76
56	80
57	83
58	84
59	85
60	89
61	90
62	96
63	97
64	98
65	99
66	100
67	107
68	108
69	109
70	119

[1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 22, 23, 24, 25, 26, 30, 31, 32, 33, 35, 36, 37, 39, 40, 41, 42, 43, 47, 48, 49, 50, 55, 56, 57, 58, 63, 64, 65, 66, 67, 68, 71, 72, 73, 75, 76, 80, 83, 84, 85, 89, 90, 96, 97, 98, 99, 100, 107, 108, 109, 119]

cp's OEIS Frontend

A020731 Numbers n for which number of distinct prime divisors of C(n,k) has maximum at k = [n/2].

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	11
11	12
12	13
13	14
14	15
15	16
16	17
17	18
18	19
19	21
20	22
21	23
22	24
23	25
24	26
25	30
26	31
27	32
28	33
29	35
30	36
31	37
32	39
33	40
34	41
35	42
36	43
37	47
38	48
39	49
40	50
41	55
42	56
43	57
44	58
45	63
46	64
47	65
48	66
49	67
50	68
51	71
52	72
53	73
54	75
55	76
56	80
57	83
58	84
59	85
60	89
61	90
62	96
63	97
64	98
65	99
66	100
67	107
68	108
69	109
70	119

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	11
11	12
12	13
13	14
14	15
15	16
16	17
17	18
18	19
19	21
20	22
21	23
22	24
23	25
24	26
25	30
26	31
27	32
28	33
29	35
30	36
31	37
32	39
33	40
34	41
35	42
36	43
37	47
38	48
39	49
40	50
41	55
42	56
43	57
44	58
45	63
46	64
47	65
48	66
49	67
50	68
51	71
52	72
53	73
54	75
55	76
56	80
57	83
58	84
59	85
60	89
61	90
62	96
63	97
64	98
65	99
66	100
67	107
68	108
69	109
70	119

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	11
11	12
12	13
13	14
14	15
15	16
16	17
17	18
18	19
19	21
20	22
21	23
22	24
23	25
24	26
25	30
26	31
27	32
28	33
29	35
30	36
31	37
32	39
33	40
34	41
35	42
36	43
37	47
38	48
39	49
40	50
41	55
42	56
43	57
44	58
45	63
46	64
47	65
48	66
49	67
50	68
51	71
52	72
53	73
54	75
55	76
56	80
57	83
58	84
59	85
60	89
61	90
62	96
63	97
64	98
65	99
66	100
67	107
68	108
69	109
70	119