Numbers k such that k! has a prime number of digits.

Terms

a(0) =4a(1) =5a(2) =6a(3) =8a(4) =10a(5) =14a(6) =15a(7) =20a(8) =23a(9) =27a(10) =29a(11) =33a(12) =35a(13) =39a(14) =43a(15) =51a(16) =58a(17) =68a(18) =70a(19) =84a(20) =86a(21) =89a(22) =90a(23) =95a(24) =104a(25) =107a(26) =110a(27) =111a(28) =116a(29) =117