Smallest prime p such that p! ends with exactly 10^n trailing 0's (or 0, if no such p exists).

Terms

a(0) =5a(1) =47a(2) =409a(3) =4007a(4) =40013a(5) =400009a(6) =0a(7) =0a(8) =0a(9) =4000000019a(10) =0a(11) =400000000019a(12) =0a(13) =0a(14) =0a(15) =0a(16) =0a(17) =0a(18) =0a(20) =0a(21) =0a(22) =0a(23) =0a(25) =0a(26) =0a(27) =0a(28) =0a(29) =0a(30) =0a(31) =0