A220027 - cp's OEIS frontend

A220027 a(n) = product(i >= 0, P(n, i)^(2^i)) where P(n, i) = product(p prime, n/2^(i+1) < p <= n/2^i).

n	a(n)
0	1
1	1
2	2
3	6
4	12
5	60
6	180
7	1260
8	5040
9	5040
10	25200
11	277200
12	2494800
13	32432400
14	227026800
15	227026800
16	3632428800
17	61751289600
18	61751289600
19	1173274502400
20	29331862560000
21	29331862560000
22	322650488160000
23	7420961227680000
24	601097859442080000
25	601097859442080000

[1, 1, 2, 6, 12, 60, 180, 1260, 5040, 5040, 25200, 277200, 2494800, 32432400, 227026800, 227026800, 3632428800, 61751289600, 61751289600, 1173274502400, 29331862560000, 29331862560000, 322650488160000, 7420961227680000, 601097859442080000, 601097859442080000]

cp's OEIS Frontend

A220027 a(n) = product(i >= 0, P(n, i)^(2^i)) where P(n, i) = product(p prime, n/2^(i+1) < p <= n/2^i).

Table of values

List of values