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TheRandomGuy
  • Member for 6 years, 11 months
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20 votes
Accepted

Prove the fractions aren't integers

7 votes

If $a$ is not divisible by $7$, then $a^3 - 1$ or $a^3 + 1$ is divisible by $7$

6 votes

Broken Clock vs Normal Clock

5 votes
Accepted

Prove or disprove $ab\mid ac\Longrightarrow b\mid c$

5 votes

Prove that if $n$ is divisible by a prime number $p$ then neither $n^2 +1$ nor $n^2 -1$ will be divisible by $p$.

4 votes
Accepted

The Number of Two-digit Primes Which the Sum of their Digits is 6

4 votes
Accepted

Prove that $\forall \ n \in \mathbb{N}, \ n^2 + 3n + 2$ is not prime

3 votes

Instantaneously at Rest. What does it mean?

3 votes

Solving a Word Problem relating to factorisation

3 votes
Accepted

Alternative proof of Euler's result that $641$ divides $2^{32} + 1$

3 votes
Accepted

Divisiblity of an expression by 3

2 votes

Show that if $n\equiv 3, 6 \pmod9 $ then $n$ is not a sum of two squares

2 votes
Accepted

Find the number of trailing zeros in $n!$.

2 votes
Accepted

Polynomial, pseudoprimes

2 votes
Accepted

If a and b are integers and m is a positive integer, then a is congruent to b modulo m if m divides a − b, i.e. m | a − b.

2 votes

What two numbers, not multiples of ten, when multiplied together give a number with at least two trailing zeros?

2 votes
Accepted

Confusing Inequality

2 votes

Show that every nonzero integer has balanced ternary expansion?

2 votes

diophantine equation $x^3+x^2-16=2^y$

1 vote
Accepted

Prove that a linear equation in two variables has infinitely many solutions.

1 vote
Accepted

Proof using induction: $n! > n^2$, for $n\geq4$

1 vote

Is it irrational?

1 vote
Accepted

If a prime $p>2$ is expressible as $p=a^2+b^2$, then $4\mid (p-1)$

1 vote
Accepted

Please help me complete my proof? (Based on H.C.F of integers)

1 vote

Trailing zeroes in product of numbers with factorial power

1 vote
Accepted

Prove that $\gcd(30m + 5, 11m + 4)|65$ and find the least value of $m \in \mathbb{N}$ such that $\gcd(30m + 5, 11m + 4) = 65$

1 vote

Question about a specific part of proving $\sqrt 7$ is irrational

1 vote

Number theory problem for undergraduates

1 vote

if $p\mid a$ and $p\mid b$ then $p\mid \gcd(a,b)$

1 vote

Figure this riddle out