A055859 - cp's OEIS frontend

A055859 a(n) and floor(a(n)/7) are both squares; i.e., squares which remain squares when written in base 7 and last digit is removed.

n	a(n)
1	0
2	1
3	4
4	9
5	64
6	256
7	2025
8	16129
9	64516
10	514089
11	4096576
12	16386304
13	130576329
14	1040514049
15	4162056196
16	33165873225
17	264286471744
18	1057145886976
19	8424001222569
20	67127723308801
21	268510893235204
22	2139663144659049
23	17050177433963584
24	68200709735854336

[0, 1, 4, 9, 64, 256, 2025, 16129, 64516, 514089, 4096576, 16386304, 130576329, 1040514049, 4162056196, 33165873225, 264286471744, 1057145886976, 8424001222569, 67127723308801, 268510893235204, 2139663144659049, 17050177433963584, 68200709735854336]

cp's OEIS Frontend

A055859 a(n) and floor(a(n)/7) are both squares; i.e., squares which remain squares when written in base 7 and last digit is removed.

Table of values

List of values