User Peter Phipps

5 votes

Does this equation have a solution?

answered Dec 9, 2022 at 16:15

1 vote

Accepted

If $k$ is the greatest integer such that $k < \sqrt{n+2}$ and $k|n$, prove that $n$ is a perfect square

answered Nov 11, 2022 at 20:01

5 votes

What way can someone color this image to illustrate the Four Color Theorem?

answered Jun 2, 2022 at 21:17

1 vote

Calculator contradicting true statement

answered Feb 10, 2022 at 23:33

1 vote

Where to stop when doing decimal division?

answered Nov 16, 2021 at 17:02

1 vote

Parsing absolute value signs: Does $|x|x|x| =|x|\cdot x \cdot |x|$ or $ {\large|} x\cdot |x| \cdot x{ \large |}$?

answered Aug 20, 2021 at 13:58

3 votes

Solving factorial equation $ x!=\left(x-1\right)! + 96 $

answered Jun 19, 2021 at 16:02

0 votes

How to desgin a fair raffle

answered Mar 2, 2021 at 11:34

-1 votes

Accepted

Given a natural number $n< 10^{9},$ find the maximum number of the multiple of $3,$ which differs by exactly one digit from the given one

answered Dec 22, 2020 at 11:12

0 votes

find out the fractional part for $\sqrt{25} + \sqrt{24}$

answered Sep 28, 2020 at 8:31

2 votes

How to solve for unknown symbols in a base-3 number system?

answered Apr 4, 2020 at 20:35

3 votes

Accepted

any other symmetrical number like this?

answered Mar 12, 2020 at 21:20

1 vote

prove that $2^{3n}\equiv 1$ (mod 7) for every integer $n>0$

answered Feb 20, 2020 at 21:20

0 votes

For rational numbers $a, b$, what is the range of $b$ such that $\lceil a + b \rfloor = \lceil a \rfloor$ holds?

answered Nov 13, 2019 at 17:06

1 vote

What is the principal root of $\sqrt{-i}$?

answered Oct 1, 2019 at 13:54

6 votes

How is this read correctly (problem with brackets)? 2^2048 - 2^1984 - 1 + 2^64 * { [2^1918 pi] + 124476 }

answered Jun 10, 2019 at 23:31

0 votes

Accepted

Common Root in Quadratic Equation

answered Jul 26, 2018 at 20:21

0 votes

An interesting sequence,Look and say sequnce

answered Jun 23, 2018 at 11:12

0 votes

Checking a binary number is OK

answered Jun 19, 2018 at 19:24

0 votes

What does $x=\sum 2^{8(n-i)}x_i$ mean in words?

answered Jan 10, 2018 at 1:20

-1 votes

Accepted

Mixture and Alligation question:

answered Feb 8, 2017 at 16:11

1 vote

Probability that my roll on a die will be higher than yours: Why divide by 6?

answered Dec 27, 2016 at 20:33

1 vote

The difference between 3 digit number and reversing its digit is always divisible by

answered Oct 8, 2016 at 14:42

1 vote

Karatsuba multiplication for $x = 123 , y = 100$

answered May 10, 2016 at 20:16

4 votes

Find the remainder of a number with a large exponent

answered Sep 27, 2015 at 22:39

2 votes

Accepted

Find a formula for a function which must increase with $0.5$ at every step$=40$.

answered Jun 3, 2014 at 10:30

5 votes

How to prove the following numbers odd and even respectively?

answered Apr 30, 2014 at 10:07

1 vote

Proving $\, a\equiv \bar a\Rightarrow a^b\equiv \bar a^b\, \pmod{\!n},\, $ e.g. $\,\bar a = a\bmod n$ [Congruence Power Rule]

answered Apr 20, 2014 at 18:30

2 votes

Accepted

Find the angle between two tangent lines...

answered Apr 20, 2014 at 14:03

7 votes

What is the next number?

answered Mar 17, 2014 at 20:59

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81 Answers

Does this equation have a solution?

If $k$ is the greatest integer such that $k < \sqrt{n+2}$ and $k|n$, prove that $n$ is a perfect square

What way can someone color this image to illustrate the Four Color Theorem?

Calculator contradicting true statement

Where to stop when doing decimal division?

Parsing absolute value signs: Does $|x|x|x| =|x|\cdot x \cdot |x|$ or $ {\large|} x\cdot |x| \cdot x{ \large |}$?

Solving factorial equation $ x!=\left(x-1\right)! + 96 $

How to desgin a fair raffle

Given a natural number $n< 10^{9},$ find the maximum number of the multiple of $3,$ which differs by exactly one digit from the given one

find out the fractional part for $\sqrt{25} + \sqrt{24}$

How to solve for unknown symbols in a base-3 number system?

any other symmetrical number like this?

prove that $2^{3n}\equiv 1$ (mod 7) for every integer $n>0$

For rational numbers $a, b$, what is the range of $b$ such that $\lceil a + b \rfloor = \lceil a \rfloor$ holds?

What is the principal root of $\sqrt{-i}$?

How is this read correctly (problem with brackets)? 2^2048 - 2^1984 - 1 + 2^64 * { [2^1918 pi] + 124476 }

Common Root in Quadratic Equation

An interesting sequence,Look and say sequnce

Checking a binary number is OK

What does $x=\sum 2^{8(n-i)}x_i$ mean in words?

Mixture and Alligation question:

Probability that my roll on a die will be higher than yours: Why divide by 6?

The difference between 3 digit number and reversing its digit is always divisible by

Karatsuba multiplication for $x = 123 , y = 100$

Find the remainder of a number with a large exponent

Find a formula for a function which must increase with $0.5$ at every step$=40$.

How to prove the following numbers odd and even respectively?

Proving $\, a\equiv \bar a\Rightarrow a^b\equiv \bar a^b\, \pmod{\!n},\, $ e.g. $\,\bar a = a\bmod n$ [Congruence Power Rule]

Find the angle between two tangent lines...

What is the next number?