A005265 - cp's OEIS frontend

A005265 a(1)=3, b(n) = Product_{k=1..n} a(k), a(n+1) is the smallest prime factor of b(n)-1.

n	a(n)
1	3
2	2
3	5
4	29
5	11
6	7
7	13
8	37
9	32222189
10	131
11	136013303998782209
12	31
13	197
14	19
15	157
16	17
17	8609
18	1831129
19	35977
20	508326079288931
21	487
22	10253
23	1390043
24	18122659735201507243
25	25319167
26	9512386441
27	85577
28	1031
29	3650460767
30	107
31	41
32	811
33	15787
34	89
35	68168743
36	4583
37	239
38	1283
39	443
40	902404933
41	64775657
42	2753
43	23
44	149287
45	149749
46	7895159
47	79
48	43
49	1409
50	184274081
51	47
52	569
53	63843643

[3, 2, 5, 29, 11, 7, 13, 37, 32222189, 131, 136013303998782209, 31, 197, 19, 157, 17, 8609, 1831129, 35977, 508326079288931, 487, 10253, 1390043, 18122659735201507243, 25319167, 9512386441, 85577, 1031, 3650460767, 107, 41, 811, 15787, 89, 68168743, 4583, 239, 1283, 443, 902404933, 64775657, 2753, 23, 149287, 149749, 7895159, 79, 43, 1409, 184274081, 47, 569, 63843643]

cp's OEIS Frontend

A005265 a(1)=3, b(n) = Product_{k=1..n} a(k), a(n+1) is the smallest prime factor of b(n)-1.

Table of values

List of values