Question

Ways to check whether a number is multiple of another number.

score 18.2k · Answer 1 · 2017-02-12 10:44:40

18.2k

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Ways to check whether a number is multiple of another number.

Published on 12 Feb 2017 - 10:44

score 1.2k · Answer 2 · 2026-03-24 12:44:40

1.2k

Views

Let $a$ and $b$ be positive integers. Prove that $(a,b)|[a,b]$.

Published on 24 Mar 2026 - 12:44

score 383 · Answer 3 · 2026-03-26 03:11:37

383

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Let $n$ be an integer. Prove that there exist $k, m$ integers such that $n=2^km$

Published on 26 Mar 2026 - 3:11

score 196 · Answer 4 · 2017-02-14 05:47:40

196

Views

BMO 1 1998 question 2

Published on 14 Feb 2017 - 5:47

score 31 · Answer 5 · 2026-02-23 09:32:07

31

Views

How to make N equal instalments of any amount?

Published on 23 Feb 2026 - 9:32

score 58 · Answer 6 · 2017-02-14 19:16:08

58

Views

Let $a$ and $b$ be relatively prime: show $a\mid bc\implies a\mid c$

Published on 14 Feb 2017 - 19:16

score 167 · Answer 7 · 2026-03-25 19:16:06

167

Views

A generalization of a divisibility relation for Fibonacci numbers

Published on 25 Mar 2026 - 19:16

score 764 · Answer 8 · 2026-03-28 02:04:54

764

Views

Show if $p > 3$ is prime, then $(p + 1) | p!$

Published on 28 Mar 2026 - 2:04

score 940 · Answer 9 · 2017-02-16 16:14:52

940

Views

How do I prove that $3$ divides $14^{2n}-1$ by induction?

Published on 16 Feb 2017 - 16:14

score 3.2k · Answer 10 · 2026-03-29 23:30:27

3.2k

Views

Lattice divisors of 150, ordered by divisibility. Draw Hasse diagram, get complements, check if distributive, check if Boolean.

Published on 29 Mar 2026 - 23:30

score 1.7k · Answer 11 · 2026-03-24 01:46:27

1.7k

Views

find and prove the necessary and sufficient condition in which (a,b)=[a,b]

Published on 24 Mar 2026 - 1:46

score 94 · Answer 12 · 2026-03-28 02:04:28

94

Views

if $a\cong b\pmod m$ prove $(a,m)=(b,m)$

Published on 28 Mar 2026 - 2:04

score 92 · Answer 13 · 2017-02-18 22:33:02

92

Views

Need helping going about proving that a number is not divisible by 3 without a calculator

Published on 18 Feb 2017 - 22:33

score 69 · Answer 14 · 2017-02-18 23:42:44

69

Views

Need help proving that $3\mid(14^{2n} - 1)$ for all n = 0, 1, 2, 3, ...

Published on 18 Feb 2017 - 23:42

score 75 · Answer 15 · 2017-02-19 01:43:54

75

Views

How many pairs of digits A,B such that ABA+BAB is divisible by 74?

Published on 19 Feb 2017 - 1:43

List Question

Ways to check whether a number is multiple of another number.

Let $a$ and $b$ be positive integers. Prove that $(a,b)|[a,b]$.

Let $n$ be an integer. Prove that there exist $k, m$ integers such that $n=2^km$

BMO 1 1998 question 2

How to make N equal instalments of any amount?

Let $a$ and $b$ be relatively prime: show $a\mid bc\implies a\mid c$

A generalization of a divisibility relation for Fibonacci numbers

Show if $p > 3$ is prime, then $(p + 1) | p!$

How do I prove that $3$ divides $14^{2n}-1$ by induction?

Lattice divisors of 150, ordered by divisibility. Draw Hasse diagram, get complements, check if distributive, check if Boolean.

find and prove the necessary and sufficient condition in which (a,b)=[a,b]

if $a\cong b\pmod m$ prove $(a,m)=(b,m)$

Need helping going about proving that a number is not divisible by 3 without a calculator

Need help proving that $3\mid(14^{2n} - 1)$ for all n = 0, 1, 2, 3, ...

How many pairs of digits A,B such that ABA+BAB is divisible by 74?

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