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Given a number that ends in 3, prove that it has a multiple that consists of only 1's.
For instance 13 has the multiple 111111.
For instance 13 has the multiple 111111.
[sp]Klaas van Aarsen said:Given a number that ends in 3, prove that it has a multiple that consists of only 1's.
For instance 13 has the multiple 111111.
[sp]Let $R_n$ be the number consisting of $n$ $1$s. If $n>m$ then $R_n - R_m$ consists of $n-m$ $1$s followed by $m$ $0$s. So $R_n - R_m = 10^mR_{n-m}$.Klaas van Aarsen said:Given a number that ends in 3, prove that it has a multiple that consists of only 1's.
For instance 13 has the multiple 111111.
Klaas van Aarsen said:Given a number that ends in 3, prove that it has a multiple that consists of only 1's.
For instance 13 has the multiple 111111.
The significance of a number consisting of only 1's is that it is known as a repunit, which is a number that contains only repeating digits. In this case, all the digits are 1. Repunits have been studied in mathematics for their patterns and properties.
A number consisting of only 1's can have any number of digits, as long as they are all 1. This means that it can be infinitely long, with an infinite number of 1's.
The largest known number consisting of only 1's is called a googolplex, which is 10 to the power of a googol (10^10^100). This number is so large that it cannot be written out in standard notation, and it would take more than the estimated age of the universe to write out all the digits.
While numbers consisting of only 1's may not have practical applications in everyday life, they have been used in cryptography and coding theory. They also have interesting properties in number theory and have been studied in various mathematical fields.
No, numbers consisting of only 1's cannot be prime. A prime number is defined as a number that is only divisible by 1 and itself. Since a number consisting of only 1's is divisible by 1, it does not meet the criteria for being a prime number.