8000002domain: NAppears in sequencesNumbers k such that the k-th triangular number contains only digits {0,2,3}.at n=11A119050Smallest k such that each of the five factorials (5k)!, (5k+1)!, (5k+2)!, (5k+3)! and (5k+4)! has exactly 10^n trailing 0's. Zero, if no such k exists.at n=7A181581