A330252 - cp's OEIS frontend

A330252 a(1) = 1; for n > 1, a(n) = n*a(n-1) if n is a prime, otherwise a(n) = floor(a(n-1)/A020639(n)), where A020639(n) is the smallest prime divisor of n.

n	a(n)
1	1
2	2
3	6
4	3
5	15
6	7
7	49
8	24
9	8
10	4
11	44
12	22
13	286
14	143
15	47
16	23
17	391
18	195
19	3705
20	1852
21	617
22	308
23	7084
24	3542
25	708
26	354
27	118
28	59
29	1711
30	855
31	26505
32	13252
33	4417
34	2208
35	441
36	220
37	8140
38	4070
39	1356
40	678
41	27798
42	13899
43	597657
44	298828
45	99609
46	49804
47	2340788
48	1170394
49	167199
50	83599

[1, 2, 6, 3, 15, 7, 49, 24, 8, 4, 44, 22, 286, 143, 47, 23, 391, 195, 3705, 1852, 617, 308, 7084, 3542, 708, 354, 118, 59, 1711, 855, 26505, 13252, 4417, 2208, 441, 220, 8140, 4070, 1356, 678, 27798, 13899, 597657, 298828, 99609, 49804, 2340788, 1170394, 167199, 83599]

cp's OEIS Frontend

A330252 a(1) = 1; for n > 1, a(n) = n*a(n-1) if n is a prime, otherwise a(n) = floor(a(n-1)/A020639(n)), where A020639(n) is the smallest prime divisor of n.

Table of values

List of values