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A239684
Number of digits in the decimal expansion of n^4.
0
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, 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, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8
OFFSET
0,3
FORMULA
a(n) = A055642(n^4).
EXAMPLE
For n=1, a(1)=1 because 1^4=1.
For n=5, a(5)=3 because 5^4=625.
MATHEMATICA
Join[{1}, IntegerLength[Range[90]^4]] (* Harvey P. Dale, Sep 06 2015 *)
CROSSREFS
Cf. A055642.
Sequence in context: A262558 A156876 A137397 * A062571 A277903 A102515
KEYWORD
nonn,base,easy
AUTHOR
Lorianne Kwak, Mar 24 2014
STATUS
approved