A057602 - cp's OEIS frontend

A057602 a(1)=2, a(n+1) is the smallest integer > a(n) such that the smallest prime factor of a(n+1) is the largest prime factor of a(n).

n	a(n)
1	2
2	4
3	6
4	9
5	15
6	25
7	35
8	49
9	77
10	121
11	143
12	169
13	221
14	289
15	323
16	361
17	437
18	529
19	667
20	841
21	899
22	961
23	1147
24	1369
25	1517
26	1681
27	1763
28	1849
29	2021
30	2209
31	2491
32	2809
33	3127
34	3481
35	3599
36	3721
37	4087
38	4489
39	4757
40	5041
41	5183
42	5329
43	5767
44	6241
45	6557
46	6889
47	7387
48	7921

[2, 4, 6, 9, 15, 25, 35, 49, 77, 121, 143, 169, 221, 289, 323, 361, 437, 529, 667, 841, 899, 961, 1147, 1369, 1517, 1681, 1763, 1849, 2021, 2209, 2491, 2809, 3127, 3481, 3599, 3721, 4087, 4489, 4757, 5041, 5183, 5329, 5767, 6241, 6557, 6889, 7387, 7921]

cp's OEIS Frontend

A057602 a(1)=2, a(n+1) is the smallest integer > a(n) such that the smallest prime factor of a(n+1) is the largest prime factor of a(n).

Table of values

List of values