A117713 - cp's OEIS frontend

A117713 a(1)=1, a(2)=3, a(3)=8; for n>=4, a(n) = 10*a(n-3) + 8 (if a(n-3) is odd) or + 9 (if a(n-3) is even).

n	a(n)
1	1
2	3
3	8
4	18
5	38
6	89
7	189
8	389
9	898
10	1898
11	3898
12	8989
13	18989
14	38989
15	89898
16	189898
17	389898
18	898989
19	1898989
20	3898989
21	8989898
22	18989898
23	38989898
24	89898989
25	189898989
26	389898989
27	898989898
28	1898989898
29	3898989898
30	8989898989
31	18989898989
32	38989898989
33	89898989898

[1, 3, 8, 18, 38, 89, 189, 389, 898, 1898, 3898, 8989, 18989, 38989, 89898, 189898, 389898, 898989, 1898989, 3898989, 8989898, 18989898, 38989898, 89898989, 189898989, 389898989, 898989898, 1898989898, 3898989898, 8989898989, 18989898989, 38989898989, 89898989898]

cp's OEIS Frontend

A117713 a(1)=1, a(2)=3, a(3)=8; for n>=4, a(n) = 10*a(n-3) + 8 (if a(n-3) is odd) or + 9 (if a(n-3) is even).

Table of values

List of values