88877778
domain: N
Appears in sequences
- Triangular numbers that contain exactly 2 different digits.at n=35A062691
- Triangular numbers in which neighboring digits differ at most by 1. Allowed neighbors of 9 are 0, 8 and 9.at n=32A068149
- Triangular numbers with strictly increasing sum of digits.at n=23A068808
- Smallest n-digit triangular number with maximum digit sum.at n=7A069669
- Triangular numbers composed of digits {0,7,8}.at n=4A119093
- Triangular numbers composed of digits {1,7,8}.at n=10A119146
- Triangular numbers composed of digits {2,7,8}.at n=10A119178
- Triangular numbers composed of digits {3,7,8}.at n=5A119200
- Triangular numbers composed of digits {4,7,8}.at n=5A119216
- Triangular numbers composed of digits {5,7,8}.at n=11A119224
- Triangular numbers composed of digits {6,7,8}.at n=8A119230
- Triangular numbers composed of digits {7,8,9}.at n=3A119236
- Triangular numbers having only 1 or 2 different digits in base 10.at n=42A213516
- a(n) = (8*10^(2n) - 10^(n+1) + 2) / 9.at n=3A383942