A368133 - cp's OEIS frontend

A368133 a(1,2,3) = 1,2,3; let j = a(n-1), M(n) = Product_{i = 1..n-2} { p a distinct prime: p | a(i), gcd(p, j) = 1 }. For n > 3, a(n) is the least novel multiple of M(n) if M(n) > 1; otherwise a(n) is the least novel multiple of A053669(j), the smallest prime which does not divide j.

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	5
7	12
8	10
9	9
10	20
11	15
12	8
13	30
14	7
15	60
16	14
17	45
18	28
19	75
20	42
21	25
22	84
23	35
24	18
25	70
26	21
27	40
28	63
29	50
30	105
31	16
32	210
33	11
34	420
35	22
36	315
37	44
38	525
39	66
40	140
41	33
42	280
43	99
44	350
45	132
46	175
47	198
48	245
49	264
50	385
51	24
52	770
53	27
54	1540
55	36
56	1155
57	26
58	2310
59	13
60	4620
61	39
62	3080

[1, 2, 3, 4, 6, 5, 12, 10, 9, 20, 15, 8, 30, 7, 60, 14, 45, 28, 75, 42, 25, 84, 35, 18, 70, 21, 40, 63, 50, 105, 16, 210, 11, 420, 22, 315, 44, 525, 66, 140, 33, 280, 99, 350, 132, 175, 198, 245, 264, 385, 24, 770, 27, 1540, 36, 1155, 26, 2310, 13, 4620, 39, 3080]

cp's OEIS Frontend

A368133 a(1,2,3) = 1,2,3; let j = a(n-1), M(n) = Product_{i = 1..n-2} { p a distinct prime: p | a(i), gcd(p, j) = 1 }. For n > 3, a(n) is the least novel multiple of M(n) if M(n) > 1; otherwise a(n) is the least novel multiple of A053669(j), the smallest prime which does not divide j.

Table of values

List of values