What is the shortest way to write the number $1234567890$?
Here's a challenge : find the shortest way to write the number $1234567890$ . There is several ways to write the number $1234567890$ : $1.23456789 × 10^9$ $2×3^2×5×3607×3803$ …
Why does this pattern occur: - Mathematics Stack Exchange
Dec 31, 2019 · Stack Exchange Network. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for …
Why is $\frac {987654321} {123456789} = 8.0000000729?!$
May 20, 2013 · Many years ago, I noticed that $987654321/123456789 = 8.0000000729\\ldots$. I sent it in to Martin Gardner at Scientific American and he published it in his column!!! My life …
Does $\\pi$ contain the combination $ 1234567890$?
In the first 1 billion digits of $\pi$, I found two instances of $123456789$, but no instances of $1234567890$. Here's a simple example. In the first billion digits, there were $10049$ …
Are there infinitely many primes of the form
Oct 4, 2016 · Related to this question, What is the smallest prime number made of sequential number? are there infinitely many primes of the following form (OEIS A057137)? $1, 12, 123, …
Puzzle - 123456789 = 100 with three operations? - Mathematics …
May 29, 2015 · Given the sequence 123456789: You can insert three operations ($+$,$-$,$\\times$,$/$) into this sequence to make the equation = 100. My question is: is there a way …
Why does $987,654,321$ divided by $123,456,789 = 8$?
Jan 20, 2017 · Consider the product. $$9\cdot123456789=1111111101.$$ This pattern is due to the fact that $9$ is one less than the basis of the numeration so that the products with …
Permutation identities similar to - Mathematics Stack Exchange
$(7901234568 / 9876543210) * 1234567890 = 0987654312$ The above re-write (with slightly artificial but still valid pre-pending right hand side of the initial arithmetic identity with leftmost …
number theory - $12345679$ and friends - Mathematics Stack …
We can see that in the decimal system each of $12345679\times k$ $(k\in\mathbb N, k\lt 81, k\ \text{is coprime to $9$})$ (note! not $123456789$) has every number from $0$ to $9$ except …
Why is $\\frac{987654321}{123456789}$ almost exactly $8$?
May 7, 2017 · I just started typing some numbers in my calculator and accidentally realized that $\frac{123456789}{987654321}=1/8$ and vice versa …