A308480 - cp's OEIS frontend

A308480 a(n) = A000225(n) if n is prime, a(n) = A020639(n) otherwise.

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]

cp's OEIS Frontend

A308480 a(n) = A000225(n) if n is prime, a(n) = A020639(n) otherwise.

Table of values

List of values