1787109375domain: NAppears in sequencesa(n) = 10^n - (5^(2^n) mod 10^n).at n=9A216093a(n) is the smallest number m such that the m-th triangular number ends in n zeros.at n=9A228191Least positive number k such that n^n divides k*(k+1)/2.at n=9A342930