A055812 - cp's OEIS frontend

A055812 a(n) and floor(a(n)/5) are both squares; i.e., squares which remain squares when written in base 5 and last digit is removed.

n	a(n)
1	0
2	1
3	4
4	9
5	49
6	81
7	324
8	2209
9	15129
10	25921
11	103684
12	710649
13	4870849
14	8346321
15	33385284
16	228826129
17	1568397609
18	2687489281
19	10749957124
20	73681302249
21	505019158609
22	865363202001
23	3461452808004

[0, 1, 4, 9, 49, 81, 324, 2209, 15129, 25921, 103684, 710649, 4870849, 8346321, 33385284, 228826129, 1568397609, 2687489281, 10749957124, 73681302249, 505019158609, 865363202001, 3461452808004]

cp's OEIS Frontend

A055812 a(n) and floor(a(n)/5) are both squares; i.e., squares which remain squares when written in base 5 and last digit is removed.

Table of values

List of values