cp's OEIS Frontend

A239684 Number of digits in the decimal expansion of n^4.

%I A239684 #21 Sep 07 2022 22:25:57
%S A239684 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 A239684 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 A239684 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8
%N A239684 Number of digits in the decimal expansion of n^4.
%F A239684 a(n) = A055642(n^4).
%e A239684 For n=1, a(1)=1 because 1^4=1.
%e A239684 For n=5, a(5)=3 because 5^4=625.
%t A239684 Join[{1},IntegerLength[Range[90]^4]] (* _Harvey P. Dale_, Sep 06 2015 *)
%Y A239684 Cf. A055642.
%K A239684 nonn,base,easy
%O A239684 0,3
%A A239684 _Lorianne Kwak_, Mar 24 2014