A318151 - cp's OEIS frontend

A318151 e-numbers of unlabeled rooted trees with empty leaves o[] allowed. A number n is in the sequence iff n = 2^(prime(y_1) * ... * prime(y_k)) for some k >= 0 and y_1, ..., y_k already in the sequence.

n	a(n)
1	1
2	2
3	4
4	8
5	16
6	64
7	128
8	256
9	512
10	4096
11	16384
12	65536
13	262144
14	524288
15	2097152
16	16777216
17	134217728
18	268435456
19	4294967296
20	68719476736
21	274877906944
22	4398046511104
23	281474976710656
24	562949953421312
25	9007199254740992
26	18014398509481984
27	72057594037927936

[1, 2, 4, 8, 16, 64, 128, 256, 512, 4096, 16384, 65536, 262144, 524288, 2097152, 16777216, 134217728, 268435456, 4294967296, 68719476736, 274877906944, 4398046511104, 281474976710656, 562949953421312, 9007199254740992, 18014398509481984, 72057594037927936]

cp's OEIS Frontend

A318151 e-numbers of unlabeled rooted trees with empty leaves o[] allowed. A number n is in the sequence iff n = 2^(prime(y_1) * ... * prime(y_k)) for some k >= 0 and y_1, ..., y_k already in the sequence.

Table of values

List of values