8888777778
domain: N
Appears in sequences
- Triangular numbers composed of digits {0,7,8}.at n=8A119093
- Triangular numbers composed of digits {1,7,8}.at n=13A119146
- Triangular numbers composed of digits {2,7,8}.at n=14A119178
- Triangular numbers composed of digits {3,7,8}.at n=7A119200
- Triangular numbers composed of digits {4,7,8}.at n=6A119216
- Triangular numbers composed of digits {5,7,8}.at n=13A119224
- Triangular numbers composed of digits {6,7,8}.at n=9A119230
- Triangular numbers composed of digits {7,8,9}.at n=4A119236
- a(n) = (8*10^(2n) - 10^(n+1) + 2) / 9.at n=4A383942