The number 10 (ten) is the basis for the decimal system of notation. In this system, each "decimal place" consists of a digit
0-9 arranged such that each digit is multiplied by a power of 10, decreasing from left to right, and with a decimal
place indicating the 
s
place. For example, the number 1234.56 specifies
 |
(1) |
The decimal places to the left of the decimal point are 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000, ... (OEIS A011557),
called one, ten, hundred, thousand,
ten thousand, hundred thousand, million, 10 million,
100 million, and so on. The names of subsequent decimal places for large
numbers differ depending on country. Any power of 10
which can be written as the product of two numbers not
containing 0s must be of the form 
for 
an integer such that neither 
nor 
contains any zeros. The largest
known such number is
 |
(2) |
A complete list of such known numbers is
(Madachy 1979). Since all powers of 2 with exponents 
contain at
least one zero (M. Cook, pers. comm., Sept. 26,
1997), no other power of ten less than 46 million can be
written as the product of two numbers not containing
0s.
See also
Billion, Bowling, Decimal, Hundred, Large Number, Milliard, Million, Tetractys, Thousand, Trillion, Zero
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References
Madachy, J. S. Madachy's Mathematical Recreations. New York: Dover, pp. 127-128, 1979.Pickover, C. A. Keys to Infinity. New York: Wiley, p. 135, 1995.Sloane, N. J. A. Sequence A011557 in "The On-Line Encyclopedia of Integer Sequences."Wells, D. The Penguin Dictionary of Curious and Interesting Numbers. Middlesex, England: Penguin Books, pp. 76-82, 1986.
Cite this as:
Weisstein, Eric W. "10." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/10.html