A308480 - OEIS

A308480 as a simple table

n	a(n)
2	3
3	7
4	2
5	31
6	2
7	127
8	2
9	3
10	2
11	2047
12	2
13	8191
14	2
15	3
16	2
17	131071
18	2
19	524287
20	2
21	3
22	2
23	8388607
24	2
25	5
26	2
27	3
28	2
29	536870911
30	2
31	2147483647
32	2
33	3
34	2
35	5
36	2
37	137438953471
38	2
39	3
40	2
41	2199023255551
42	2
43	8796093022207
44	2
45	3
46	2
47	140737488355327
48	2
49	7
50	2
51	3
52	2
53	9007199254740991

[3,7,2,31,2,127,2,3,2,2047,2,8191,2,3,2,131071,2, 524287,2,3,2,8388607,2,5,2,3,2,536870911,2, 2147483647,2,3,2,5,2,137438953471,2,3,2, 2199023255551,2,8796093022207,2,3,2, 140737488355327,2,7,2,3,2,9007199254740991]