A081394 - cp's OEIS frontend

A081394 a(n) is the smallest k such that number of non-unitary prime divisors of central binomial coefficient, A001405(k) = C(k, floor(k/2)) equals n.

n	a(n)
0	1
1	6
2	10
3	27
4	96
5	147
6	363
7	627
8	959
9	1547
10	1919
11	2641
12	2645
13	3339
14	6241
15	6909
16	6913
17	6943
18	6923
19	6937
20	16405
21	19981
22	24325
23	31675
24	31679
25	35329
26	36959
27	36963
28	38915
29	38927
30	73563
31	39729
32	73577
33	80095
34	87205
35	87309
36	95035
37	123307
38	123305
39	123369
40	123367
41	174239
42	185915
43	186361
44	186369
45	186373
46	186381

[1, 6, 10, 27, 96, 147, 363, 627, 959, 1547, 1919, 2641, 2645, 3339, 6241, 6909, 6913, 6943, 6923, 6937, 16405, 19981, 24325, 31675, 31679, 35329, 36959, 36963, 38915, 38927, 73563, 39729, 73577, 80095, 87205, 87309, 95035, 123307, 123305, 123369, 123367, 174239, 185915, 186361, 186369, 186373, 186381]

cp's OEIS Frontend

A081394 a(n) is the smallest k such that number of non-unitary prime divisors of central binomial coefficient, A001405(k) = C(k, floor(k/2)) equals n.

Table of values

List of values