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%I #20 Dec 26 2020 23:42:46
%S 1,2,3,4,5,6,7,8,9,10,11,13,14,15,16,18,19,20,22,23,24,26,27,29,30,31,
%T 33,34,36,37,39,41,42,44,45,47,48,50,52,53,55,57,58,60,62,63,65,67,68,
%U 70,72,74,75,77,79,81,82,84,86,88,90,91,93,95,97,99,101,102
%N Possible number of digits in a factorial.
%C This is A034886 with duplicate terms removed.
%F a(n) = A034886(n+3) for n>=4.
%t DeleteDuplicates @ IntegerLength[Range[71]!] (* _Amiram Eldar_, Dec 24 2020 *)
%Y Cf. A000142, A034886.
%K nonn,base
%O 1,2
%A _Christian Amet_, Dec 18 2020