A115551 - cp's OEIS frontend

A115551 Numbers k such that the concatenation of 8*k with k gives a square.

n	a(n)
1	1
2	4
3	9
4	89
5	889
6	8889
7	88889
8	888889
9	8888889
10	88888889
11	888888889
12	1026765584
13	1066636289
14	1107266436
15	1148656025
16	1190805056
17	1233713529
18	1277381444
19	1321808801
20	1366995600
21	1412941841
22	1459647524
23	1507112649
24	1555337216

[1, 4, 9, 89, 889, 8889, 88889, 888889, 8888889, 88888889, 888888889, 1026765584, 1066636289, 1107266436, 1148656025, 1190805056, 1233713529, 1277381444, 1321808801, 1366995600, 1412941841, 1459647524, 1507112649, 1555337216]

cp's OEIS Frontend

A115551 Numbers k such that the concatenation of 8*k with k gives a square.

Table of values

List of values