## What is the most mysterious number?

6174

6174 is known as Kaprekar’s constant after the Indian mathematician D. R. Kaprekar. This number is renowned for the following rule: Take any four-digit number, using at least two different digits (leading zeros are allowed).

## Is there another number like pi?

The value of e is approximately 2.71828 and, like Pi, is irrational and extends to infinity, a fact that the Swiss polymath Leonhard Euler proved about 20 years after its discovery.

**What is the rarest number?**

Therefore the number 6174 is the only number unchanged by Kaprekar’s operation — our mysterious number is unique. The number 495 is the unique kernel for the operation on three digit numbers, and all three digit numbers reach 495 using the operation.

### What does 5 times a number mean?

“Five times a number is three less than the same number” If so, this is an entirely different problem. That “is” means equal sign. On one side you have 5 times a number, or 5n. On the other side you have three less than a number, or n – 3.

### How do you write 5 minus a number squared?

Example: What is minus 5 squared?

- square the 5, then do the minus: −(5×5) = −25.
- square (−5): (−5)×(−5) = +25.

**How do you say the number 1 million in Japanese?**

Large numbers are divided into units of ten thousand, so 1 million is one hundred ten-thousands: 百萬 (hyaku man). The numbers 4 and 9 are considered unlucky in Japanese: 4, when pronounced shi, sounds like the word for death (死), and 9, when pronounced ku, sounds like the word for suffering (苦). So they are often pronounced yon and kyu instead.

#### Why is the number 9 considered unlucky in Japanese?

The numbers 4 and 9 are considered unlucky in Japanese: 4, when pronounced shi, sounds like the word for death (死), and 9, when pronounced ku, sounds like the word for suffering (苦). So they are often pronounced yon and kyu instead. On financial and legal documents complex forms of the numerals known as 大字 (daiji) are used to prevent fraud.

#### What do you know about seven in Japanese math?

Seven is an important number in Buddhism. Japanese Buddhists celebrate a baby’s seventh day and mourn the seventh day after a person dies when the soul is said to cross over. Do you know your math in Japanese? In Japanese folklore there are the Shichifukuin (七福神 – the Seven Gods of Luck).

**How do you count people in Japanese?**

When counting people there are different forms of the native numbers from 1-10, and there are also different forms of these numbers for dates. The native Japanese numbers are usually only used up to 10. The Western (Arabic) numerals are generally used in horizontal texts, while the Kanji numerals are used in vertical texts.