A239504 Number of digits in the decimal expansion of n^10 (A008454).

1, 1, 4, 5, 7, 7, 8, 9, 10, 10, 11, 11, 11, 12, 12, 12, 13, 13, 13, 13, 14, 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 19, 19, 19

Offset: 0

Author

Lorianne Kwak, Mar 20 2014

Keywords

• nonn
• base
• easy

Examples

			a(1) = 1, because 1^10 = 1.
a(2) = 4, because 2^10 = 1024.
		

Programs

Mathematica

Join[{1},IntegerLength[Range[80]^10]] (* Harvey P. Dale, Jun 29 2021 *)

PARI

a(n) = #Str(n^10); \\ Michel Marcus, Mar 21 2014

Formula

a(n) = floor(10*log_10(n))+1 for n>0, a(0) = 1.

a(n) = A055642(n^10).