A056651 - cp's OEIS frontend

A056651 Numbers k such that binomial(k,floor(k/2)) has no non-unitary square divisors: all of their square divisors are unitary ones.

n	a(n)
1	0
2	1
3	2
4	3
5	4
6	5
7	6
8	7
9	8
10	9
11	10
12	11
13	12
14	13
15	15
16	16
17	17
18	18
19	19
20	20
21	21
22	23
23	24
24	25
25	31
26	32
27	35
28	36
29	37
30	39
31	40
32	41
33	43
34	47
35	48
36	49
37	55
38	63
39	64
40	65
41	66
42	67
43	68
44	69
45	71
46	72
47	73
48	75
49	79
50	80
51	95
52	96
53	97
54	111
55	129
56	130
57	131
58	132
59	133
60	143
61	144
62	151
63	161
64	163
65	167
66	191
67	192
68	193

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 21, 23, 24, 25, 31, 32, 35, 36, 37, 39, 40, 41, 43, 47, 48, 49, 55, 63, 64, 65, 66, 67, 68, 69, 71, 72, 73, 75, 79, 80, 95, 96, 97, 111, 129, 130, 131, 132, 133, 143, 144, 151, 161, 163, 167, 191, 192, 193]

cp's OEIS Frontend

A056651 Numbers k such that binomial(k,floor(k/2)) has no non-unitary square divisors: all of their square divisors are unitary ones.

Table of values

List of values

n	a(n)
1	0
2	1
3	2
4	3
5	4
6	5
7	6
8	7
9	8
10	9
11	10
12	11
13	12
14	13
15	15
16	16
17	17
18	18
19	19
20	20
21	21
22	23
23	24
24	25
25	31
26	32
27	35
28	36
29	37
30	39
31	40
32	41
33	43
34	47
35	48
36	49
37	55
38	63
39	64
40	65
41	66
42	67
43	68
44	69
45	71
46	72
47	73
48	75
49	79
50	80
51	95
52	96
53	97
54	111
55	129
56	130
57	131
58	132
59	133
60	143
61	144
62	151
63	161
64	163
65	167
66	191
67	192
68	193

n	a(n)
1	0
2	1
3	2
4	3
5	4
6	5
7	6
8	7
9	8
10	9
11	10
12	11
13	12
14	13
15	15
16	16
17	17
18	18
19	19
20	20
21	21
22	23
23	24
24	25
25	31
26	32
27	35
28	36
29	37
30	39
31	40
32	41
33	43
34	47
35	48
36	49
37	55
38	63
39	64
40	65
41	66
42	67
43	68
44	69
45	71
46	72
47	73
48	75
49	79
50	80
51	95
52	96
53	97
54	111
55	129
56	130
57	131
58	132
59	133
60	143
61	144
62	151
63	161
64	163
65	167
66	191
67	192
68	193

n	a(n)
1	0
2	1
3	2
4	3
5	4
6	5
7	6
8	7
9	8
10	9
11	10
12	11
13	12
14	13
15	15
16	16
17	17
18	18
19	19
20	20
21	21
22	23
23	24
24	25
25	31
26	32
27	35
28	36
29	37
30	39
31	40
32	41
33	43
34	47
35	48
36	49
37	55
38	63
39	64
40	65
41	66
42	67
43	68
44	69
45	71
46	72
47	73
48	75
49	79
50	80
51	95
52	96
53	97
54	111
55	129
56	130
57	131
58	132
59	133
60	143
61	144
62	151
63	161
64	163
65	167
66	191
67	192
68	193