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%I #21 Sep 07 2022 22:25:57
%S 1,1,2,2,3,3,4,4,4,4,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,6,6,6,6,6,6,7,7,
%T 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8,8,8,8,
%U 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8
%N Number of digits in the decimal expansion of n^4.
%F a(n) = A055642(n^4).
%e For n=1, a(1)=1 because 1^4=1.
%e For n=5, a(5)=3 because 5^4=625.
%t Join[{1},IntegerLength[Range[90]^4]] (* _Harvey P. Dale_, Sep 06 2015 *)
%Y Cf. A055642.
%K nonn,base,easy
%O 0,3
%A _Lorianne Kwak_, Mar 24 2014