Question

When is $X/R(X)$ an integer where $R(X)$ is the reverse of an integer $X$?

score 140 · Answer 1 · 2022-01-12 12:25:49

140

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When is $X/R(X)$ an integer where $R(X)$ is the reverse of an integer $X$?

Published on 12 Jan 2022 - 12:25

score 236 · Answer 2 · 2022-01-14 18:20:50

236

Views

Proving that 31123319 is the largest number with a self-accounting property (A047841)

Published on 14 Jan 2022 - 18:20

score 225 · Answer 3 · 2022-01-27 23:06:18

225

Views

Rounding $1731.9146$ to $2$ decimal places?

Published on 27 Jan 2022 - 23:06

score 40 · Answer 4 · 2022-02-04 16:51:48

40

Views

Cyclic repeating decimals

Published on 04 Feb 2022 - 16:51

score 136 · Answer 5 · 2026-03-30 14:01:06

136

Views

Difference between binary division and its decimal division

Published on 30 Mar 2026 - 14:01

score 66 · Answer 6 · 2022-02-11 01:24:14

66

Views

irrationality of a decimal expansion

Published on 11 Feb 2022 - 1:24

score 289 · Answer 7 · 2022-02-21 06:30:32

289

Views

sum of the digits of an integer

Published on 21 Feb 2022 - 6:30

score 82 · Answer 8 · 2022-02-25 08:52:34

82

Views

Can a perfect square N be composed by only 0 and 1? Where N's prime factor are only 3 and 7.

Published on 25 Feb 2022 - 8:52

score 144 · Answer 9 · 2026-04-01 03:45:46

144

Views

What is the sum of natural numbers that have $5$ digits or less, and all of the digits are distinct?

Published on 01 Apr 2026 - 3:45

score 775 · Answer 10 · 2022-03-04 03:00:10

775

Views

What is a decimal expansion?

Published on 04 Mar 2022 - 3:00

score 171 · Answer 11 · 2022-03-06 01:07:20

171

Views

Prove that there are infinitely many special numbers of the form $10^n+b$ if and only if $b-1$ is special.

Published on 06 Mar 2022 - 1:07

score 78 · Answer 12 · 2022-03-07 10:46:30

78

Views

Minimal number of games to narrow down the win rate

Published on 07 Mar 2022 - 10:46

score 71 · Answer 13 · 2022-03-08 04:48:38

71

Views

if $S(a^n+n)=1+S(n)$ for any sufficiently large $n$ if and only if $a$ is a power of $10$

Published on 08 Mar 2022 - 4:48

score 211 · Answer 14 · 2022-03-08 09:08:36

Is there an increasing arithmetic sequence the digit sum of its terms forms again an increasing arithmetic sequence?

score 589 · Answer 15 · 2022-03-12 15:12:01

589

Views

Two different decimals representing the same number

Published on 12 Mar 2022 - 15:12

List Question

When is $X/R(X)$ an integer where $R(X)$ is the reverse of an integer $X$?

Proving that 31123319 is the largest number with a self-accounting property (A047841)

Rounding $1731.9146$ to $2$ decimal places?

Cyclic repeating decimals

Difference between binary division and its decimal division

irrationality of a decimal expansion

sum of the digits of an integer

Can a perfect square N be composed by only 0 and 1? Where N's prime factor are only 3 and 7.

What is the sum of natural numbers that have $5$ digits or less, and all of the digits are distinct?

What is a decimal expansion?

Prove that there are infinitely many special numbers of the form $10^n+b$ if and only if $b-1$ is special.

Minimal number of games to narrow down the win rate

if $S(a^n+n)=1+S(n)$ for any sufficiently large $n$ if and only if $a$ is a power of $10$

Is there an increasing arithmetic sequence the digit sum of its terms forms again an increasing arithmetic sequence?

Two different decimals representing the same number

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