Question

Proof that if x has two different decimal expansions then one ends in 000... and the other ends in 999...

score 339 · Answer 1 · 2016-12-14 00:34:53

339

Views

Proof that if x has two different decimal expansions then one ends in 000... and the other ends in 999...

Published on 14 Dec 2016 - 0:34

score 268 · Answer 2 · 2016-12-16 04:01:35

268

Views

Are there any numbers a & b where $a*b = ab$?

Published on 16 Dec 2016 - 4:01

score 115 · Answer 3 · 2016-12-16 14:25:48

115

Views

Find the least positive integer $n$ such $S(n^2)+7=S(n)$

Published on 16 Dec 2016 - 14:25

score 41 · Answer 4 · 2026-03-28 15:46:06

41

Views

soft question: explaining proportions/percentages in simple terms

Published on 28 Mar 2026 - 15:46

score 262 · Answer 5 · 2016-12-17 11:45:48

262

Views

Minimal period of the decimal expansion

Published on 17 Dec 2016 - 11:45

score 3.4k · Answer 6 · 2016-12-20 01:30:01

3.4k

Views

Find the last Digit of $237^{1002}$?

Published on 20 Dec 2016 - 1:30

score 1.1k · Answer 7 · 2016-12-21 20:46:08

1.1k

Views

Does every number not ending with zero have a multiple without zero digits at all?

Published on 21 Dec 2016 - 20:46

score 157 · Answer 8 · 2016-12-21 22:35:56

157

Views

Digits of powers of $2$ and $3$

Published on 21 Dec 2016 - 22:35

score 136 · Answer 9 · 2026-03-26 01:11:57

136

Views

Is $0.a_{1}a_{2}a_{3}\cdots a_{n}\cdots$ with $a_{n}\equiv \lfloor n\sin{n}\rfloor\pmod {10}$ a rational number?

Published on 26 Mar 2026 - 1:11

score 60 · Answer 10 · 2017-01-02 21:14:39

60

Views

Mentally determining if a decimal expansion can be expressed as $\frac{m}{2^n}$ for positive integers $m, n$.

Published on 02 Jan 2017 - 21:14

score 98 · Answer 11 · 2017-01-05 14:25:24

98

Views

If $a$ is a repeating decimal, when is $c a$ a terminating decimal? $c\in \mathbb{Z}$

Published on 05 Jan 2017 - 14:25

score 113 · Answer 12 · 2026-03-28 08:31:08

113

Views

Famous irrational constants whose $n$th digit can be computed in constant time?

Published on 28 Mar 2026 - 8:31

score 90 · Answer 13 · 2017-01-09 15:43:13

90

Views

Prove that if $\frac{1}{p}$ has a period of length $k$, then $k$ devides $p-1$

Published on 09 Jan 2017 - 15:43

score 5.9k · Answer 14 · 2017-01-12 00:09:53

5.9k

Views

How do we know that Cantor's diagonalization isn't creating a different decimal of the same number?

Published on 12 Jan 2017 - 0:09

score 878 · Answer 15 · 2017-01-13 07:21:21

878

Views

Multiplication verification by adding digits, how does this work?

Published on 13 Jan 2017 - 7:21

List Question

Proof that if x has two different decimal expansions then one ends in 000... and the other ends in 999...

Are there any numbers a & b where $a*b = ab$?

Find the least positive integer $n$ such $S(n^2)+7=S(n)$

soft question: explaining proportions/percentages in simple terms

Minimal period of the decimal expansion

Find the last Digit of $237^{1002}$?

Does every number not ending with zero have a multiple without zero digits at all?

Digits of powers of $2$ and $3$

Is $0.a_{1}a_{2}a_{3}\cdots a_{n}\cdots$ with $a_{n}\equiv \lfloor n\sin{n}\rfloor\pmod {10}$ a rational number?

Mentally determining if a decimal expansion can be expressed as $\frac{m}{2^n}$ for positive integers $m, n$.

If $a$ is a repeating decimal, when is $c a$ a terminating decimal? $c\in \mathbb{Z}$

Famous irrational constants whose $n$th digit can be computed in constant time?

Prove that if $\frac{1}{p}$ has a period of length $k$, then $k$ devides $p-1$

How do we know that Cantor's diagonalization isn't creating a different decimal of the same number?

Multiplication verification by adding digits, how does this work?

Trending Questions

Popular # Hahtags

Popular Questions