A219964 - cp's OEIS frontend

A219964 a(n) = product(i >= 0, (P(n, i)/P(n-1, 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	3
4	2
5	5
6	3
7	7
8	4
9	1
10	5
11	11
12	9
13	13
14	7
15	1
16	16
17	17
18	1
19	19
20	25
21	1
22	11
23	23
24	81
25	1
26	13
27	1
28	49
29	29
30	1
31	31
32	256
33	1
34	17
35	1
36	1
37	37
38	19
39	1
40	625
41	41
42	1
43	43
44	121
45	1
46	23
47	47
48	6561
49	1
50	1
51	1
52	169
53	53
54	1
55	1
56	2401
57	1
58	29
59	59
60	1
61	61
62	31
63	1
64	65536
65	1
66	1
67	67
68	289
69	1
70	1
71	71

[1, 1, 2, 3, 2, 5, 3, 7, 4, 1, 5, 11, 9, 13, 7, 1, 16, 17, 1, 19, 25, 1, 11, 23, 81, 1, 13, 1, 49, 29, 1, 31, 256, 1, 17, 1, 1, 37, 19, 1, 625, 41, 1, 43, 121, 1, 23, 47, 6561, 1, 1, 1, 169, 53, 1, 1, 2401, 1, 29, 59, 1, 61, 31, 1, 65536, 1, 1, 67, 289, 1, 1, 71]

cp's OEIS Frontend

A219964 a(n) = product(i >= 0, (P(n, i)/P(n-1, i))^(2^i)) where P(n, i) = product(p prime, n/2^(i+1) < p <= n/2^i).

Table of values

List of values