A330919 - cp's OEIS frontend

A330919 Lexicographically earliest sequence of distinct squarefree numbers such that for any n > 0, either a(n)/a(n+1) or a(n+1)/a(n) is a prime number.

n	a(n)
1	1
2	2
3	6
4	3
5	15
6	5
7	10
8	30
9	210
10	42
11	14
12	7
13	21
14	105
15	35
16	70
17	770
18	110
19	22
20	11
21	33
22	66
23	330
24	165
25	55
26	385
27	77
28	154
29	462
30	231
31	1155
32	2310
33	30030
34	2730
35	390
36	78
37	26
38	13
39	39
40	195
41	65
42	130
43	910
44	182
45	91
46	273
47	546
48	6006
49	858
50	286
51	143
52	429
53	2145
54	715
55	1430
56	4290

[1, 2, 6, 3, 15, 5, 10, 30, 210, 42, 14, 7, 21, 105, 35, 70, 770, 110, 22, 11, 33, 66, 330, 165, 55, 385, 77, 154, 462, 231, 1155, 2310, 30030, 2730, 390, 78, 26, 13, 39, 195, 65, 130, 910, 182, 91, 273, 546, 6006, 858, 286, 143, 429, 2145, 715, 1430, 4290]

cp's OEIS Frontend

A330919 Lexicographically earliest sequence of distinct squarefree numbers such that for any n > 0, either a(n)/a(n+1) or a(n+1)/a(n) is a prime number.

Table of values

List of values