278287

Appears in sequences

• Lucky numbers that are concatenations of n with n + 9.at n=21A032659
• a(n) = 1 + (144 + (50 + (35 + (10 + n)*n)*n)*n)*n/120.at n=30A145127
• Number of ternary strings of length n that contain at least two 0's and at most one 1.at n=15A338230