Smallest 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.
A181581
Smallest 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.
Terms
- a(0) =1a(1) =9a(2) =81a(3) =801a(4) =8002a(5) =80001a(6) =800001a(7) =8000002a(8) =80000003a(9) =800000003a(10) =8000000003a(11) =80000000003a(12) =800000000002a(15) =0a(16) =0a(17) =0a(20) =0a(23) =0
External references
- oeis: A181581