A081393 - cp's OEIS frontend

A081393 a(n) is the smallest k such that number of non-unitary prime divisors of central binomial coefficient, A000984(k) = C(2*k,k) equals n.

n	a(n)
0	1
1	3
2	5
3	14
4	48
5	74
6	182
7	314
8	480
9	774
10	960
11	1321
12	1323
13	1670
14	3121
15	3455
16	3457
17	3472
18	3462
19	3469
20	8203
21	9991
22	12163
23	15838
24	15840
25	17665
26	18480
27	18482
28	19458
29	19464
30	36782
31	19865
32	36789
33	40048
34	43603
35	43655
36	47518
37	61654
38	61653
39	61685
40	61684
41	87120
42	92958
43	93181
44	93185
45	93187
46	93191

[1, 3, 5, 14, 48, 74, 182, 314, 480, 774, 960, 1321, 1323, 1670, 3121, 3455, 3457, 3472, 3462, 3469, 8203, 9991, 12163, 15838, 15840, 17665, 18480, 18482, 19458, 19464, 36782, 19865, 36789, 40048, 43603, 43655, 47518, 61654, 61653, 61685, 61684, 87120, 92958, 93181, 93185, 93187, 93191]

cp's OEIS Frontend

A081393 a(n) is the smallest k such that number of non-unitary prime divisors of central binomial coefficient, A000984(k) = C(2*k,k) equals n.

Table of values

List of values