Question

Elementary arithmetic question

score 66 · Answer 1 · 2014-10-01 12:39:31

66

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Elementary arithmetic question

Published on 01 Oct 2014 - 12:39

score 121 · Answer 2 · 2026-03-25 08:05:29

121

Views

Patlak equation

Published on 25 Mar 2026 - 8:05

score 157 · Answer 3 · 2026-03-25 11:08:02

157

Views

Monotonically decreasing function for multiplication product?

Published on 25 Mar 2026 - 11:08

score 144 · Answer 4 · 2014-10-02 21:51:01

144

Views

Write $1681$ using four $4$s

Published on 02 Oct 2014 - 21:51

score 133 · Answer 5 · 2026-03-25 19:04:47

133

Views

Show that $\sum_{i=1}^{n}(i-1,n)[(i,n)=1] = \phi(n) \sigma_0(n)$

Published on 25 Mar 2026 - 19:04

score 499 · Answer 6 · 2026-03-30 09:29:24

499

Views

Why is $2^{16}=65536$ the only power of $2$ less than $2^{31000}$ that doesn't contain the digits $1$, $2$, $4$ or $8$ in its decimal representation?

Published on 30 Mar 2026 - 9:29

score 763 · Answer 7 · 2014-10-04 10:42:18

763

Views

What does $23_4$ mean?

Published on 04 Oct 2014 - 10:42

score 80 · Answer 8 · 2026-03-28 14:27:25

80

Views

An inequality question involving non-negative integers

Published on 28 Mar 2026 - 14:27

score 156 · Answer 9 · 2026-03-29 17:11:48

156

Views

Is this assertion true or false? $(\exists x)(\exists y)(\forall z)(y \ne x+z \Rightarrow y\lt x)$ Cohn - Classic Algebra P7

Published on 29 Mar 2026 - 17:11

score 112 · Answer 10 · 2014-10-04 22:25:02

112

Views

x / 3 + y /3 + z / 3 = (x + y + z) / 3?

Published on 04 Oct 2014 - 22:25

score 155 · Answer 11 · 2014-10-05 13:02:50

155

Views

What is the sum of one + one in a 26 letter number system

Published on 05 Oct 2014 - 13:02

score 96 · Answer 12 · 2014-10-05 13:49:12

96

Views

how many questions did D answer correctly

Published on 05 Oct 2014 - 13:49

score 428 · Answer 13 · 2014-10-05 15:36:22

428

Views

Is it allowed to use "equal to" and "approximately equal to" in the same sentence?

Published on 05 Oct 2014 - 15:36

score 74 · Answer 14 · 2026-03-28 06:10:21

74

Views

Are there real extensions of the operations of addition, multiplication, exponentiation, etc in the other direction?

Published on 28 Mar 2026 - 6:10

score 5.9k · Answer 15 · 2014-10-06 11:40:14

5.9k

Views

Can we solve variable questions without using algebra - for example age problems?

Published on 06 Oct 2014 - 11:40

List Question

Elementary arithmetic question

Patlak equation

Monotonically decreasing function for multiplication product?

Write $1681$ using four $4$s

Show that $\sum_{i=1}^{n}(i-1,n)[(i,n)=1] = \phi(n) \sigma_0(n)$

Why is $2^{16}=65536$ the only power of $2$ less than $2^{31000}$ that doesn't contain the digits $1$, $2$, $4$ or $8$ in its decimal representation?

What does $23_4$ mean?

An inequality question involving non-negative integers

Is this assertion true or false? $(\exists x)(\exists y)(\forall z)(y \ne x+z \Rightarrow y\lt x)$ Cohn - Classic Algebra P7

x / 3 + y /3 + z / 3 = (x + y + z) / 3?

What is the sum of one + one in a 26 letter number system

how many questions did D answer correctly

Is it allowed to use "equal to" and "approximately equal to" in the same sentence?

Are there real extensions of the operations of addition, multiplication, exponentiation, etc in the other direction?

Can we solve variable questions without using algebra - for example age problems?

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