Question

Prove that $\lceil \log_{10}(n) \rceil$ equals the number of digits of $n \ne 10^a$

score 297 · Answer 1 · 2020-06-09 14:42:43

297

Views

Prove that $\lceil \log_{10}(n) \rceil$ equals the number of digits of $n \ne 10^a$

Published on 09 Jun 2020 - 14:42

score 107 · Answer 2 · 2020-06-16 11:03:49

107

Views

Turning a fraction with repeating decimals into a mixed number: why doesn't this work?

Published on 16 Jun 2020 - 11:03

score 407 · Answer 3 · 2020-06-17 14:24:55

407

Views

How to find the last $4$ digits of $2^{2020}$ with Euler

Published on 17 Jun 2020 - 14:24

score 45 · Answer 4 · 2020-06-22 16:09:43

45

Views

Infinite and finite representation of the same real number

Published on 22 Jun 2020 - 16:09

score 1.6k · Answer 5 · 2026-03-27 12:08:29

1.6k

Views

Number of $3$-digit numbers with strictly increasing digits

Published on 27 Mar 2026 - 12:08

score 201 · Answer 6 · 2020-06-29 09:46:00

201

Views

Proof that $ \mathbb{R} $ is uncountable

Published on 29 Jun 2020 - 9:46

score 127 · Answer 7 · 2020-07-04 17:49:35

127

Views

Show that for all $n$ there exist some $n$-digit number with no $0$ in it whose digit sum divides it.

Published on 04 Jul 2020 - 17:49

score 115 · Answer 8 · 2020-07-13 19:56:31

115

Views

Proof completion: Finding the length of period for $q$-nary irreducible fraction $m / n$ with $q$, $n$ coprime

Published on 13 Jul 2020 - 19:56

score 221 · Answer 9 · 2020-07-28 16:49:37

221

Views

A problem involving sum of digits of integers

Published on 28 Jul 2020 - 16:49

score 240 · Answer 10 · 2016-07-07 21:03:37

240

Views

Finding the value of abc

Published on 07 Jul 2016 - 21:03

score 98 · Answer 11 · 2016-07-10 09:40:28

98

Views

If $ a_n$ is increasingly divisible by $2$ and not a multiple of $10$ then the sum of its digits goes to infinity

Published on 10 Jul 2016 - 9:40

score 61 · Answer 12 · 2016-07-13 06:01:18

61

Views

Returning a decimal number between 0 to 1 for showing how large each number in a set of number is

Published on 13 Jul 2016 - 6:01

score 186 · Answer 13 · 2016-07-13 21:21:36

186

Views

Real numbers $r$ and $1/r$ whose decimal representations contain the same digits

Published on 13 Jul 2016 - 21:21

score 4.4k · Answer 14 · 2016-07-15 10:40:43

4.4k

Views

N is a four digit number. If the leftmost digit is removed, the resulting three digit number is 1/9th of N. How many such N are possible?

Published on 15 Jul 2016 - 10:40

score 1k · Answer 15 · 2026-03-26 21:07:19

1k

Views

Cantor Set ternary representation

Published on 26 Mar 2026 - 21:07

List Question

Prove that $\lceil \log_{10}(n) \rceil$ equals the number of digits of $n \ne 10^a$

Turning a fraction with repeating decimals into a mixed number: why doesn't this work?

How to find the last $4$ digits of $2^{2020}$ with Euler

Infinite and finite representation of the same real number

Number of $3$-digit numbers with strictly increasing digits

Proof that $ \mathbb{R} $ is uncountable

Show that for all $n$ there exist some $n$-digit number with no $0$ in it whose digit sum divides it.

Proof completion: Finding the length of period for $q$-nary irreducible fraction $m / n$ with $q$, $n$ coprime

A problem involving sum of digits of integers

Finding the value of abc

If $ a_n$ is increasingly divisible by $2$ and not a multiple of $10$ then the sum of its digits goes to infinity

Returning a decimal number between 0 to 1 for showing how large each number in a set of number is

Real numbers $r$ and $1/r$ whose decimal representations contain the same digits

N is a four digit number. If the leftmost digit is removed, the resulting three digit number is 1/9th of N. How many such N are possible?

Cantor Set ternary representation

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