Numbers k such that k divides the number of digits of k!.

Terms

a(0) =1a(1) =22a(2) =23a(3) =24a(4) =266a(5) =267a(6) =268a(7) =2712a(8) =2713a(9) =27175a(10) =27176a(11) =271819a(12) =271820a(13) =271821a(14) =2718272a(15) =2718273a(16) =27182807a(17) =27182808a(18) =271828170a(19) =271828171a(20) =271828172