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

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

Links

Table of n, a(n) for n=0..86.

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

Adjacent sequences: A239681 A239682 A239683 * A239685 A239686 A239687

Keyword

nonn,base,easy

Author

Lorianne Kwak, Mar 24 2014

Status

approved