A099150 - cp's OEIS frontend

A099150 Positive integers k such that f(k)+f(k)=concatenation of k and k, where f(k)=k(k+3)/2 (A000096).

n	a(n)
1	8
2	98
3	998
4	9998
5	99998
6	999998
7	9999998
8	99999998
9	999999998
10	9999999998
11	99999999998
12	999999999998
13	9999999999998
14	99999999999998
15	999999999999998
16	9999999999999998
17	99999999999999998
18	999999999999999998
19	9999999999999999998
20	99999999999999999998

[8, 98, 998, 9998, 99998, 999998, 9999998, 99999998, 999999998, 9999999998, 99999999998, 999999999998, 9999999999998, 99999999999998, 999999999999998, 9999999999999998, 99999999999999998, 999999999999999998, 9999999999999999998, 99999999999999999998]

cp's OEIS Frontend

A099150 Positive integers k such that f(k)+f(k)=concatenation of k and k, where f(k)=k(k+3)/2 (A000096).

Table of values

List of values