A053047 - cp's OEIS frontend

A053047 a(n) is the first (and maximal) power of 2 arising during iterations of the Euler phi function with initial value n!.

n	a(n)
1	1
2	2
3	2
4	8
5	32
6	64
7	128
8	1024
9	1024
10	8192
11	65536
12	262144
13	1048576
14	4194304
15	16777216
16	268435456
17	4294967296
18	8589934592
19	17179869184
20	274877906944
21	549755813888
22	8796093022208
23	140737488355328
24	1125899906842624

[1, 2, 2, 8, 32, 64, 128, 1024, 1024, 8192, 65536, 262144, 1048576, 4194304, 16777216, 268435456, 4294967296, 8589934592, 17179869184, 274877906944, 549755813888, 8796093022208, 140737488355328, 1125899906842624]

cp's OEIS Frontend

A053047 a(n) is the first (and maximal) power of 2 arising during iterations of the Euler phi function with initial value n!.

Table of values

List of values