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Elementary-number-theory
New post in Elementary-number-theory
Chosen-plaintext-attack on "Affine Cipher" - Numerous questions
August 28th, 2020
elementary-number-theory
congruences
cryptography
Prove that $n^2 -1$ is divisible by $8$, for every odd integer $n$.
February 2nd, 2020
modular-arithmetic
elementary-number-theory
Prove that $a$ and $b$ are relatively prime if and only if $a^2$ and $b^2$ are relatively prime.
August 1st, 2022
elementary-number-theory
Relation between the units digit of dividend and divisor for getting the remainder
October 30th, 2020
elementary-number-theory
Problems with euclidean GCD
August 1st, 2022
elementary-number-theory
algorithms
Convergence of $\sin(nx)$
June 18th, 2020
elementary-number-theory
real-analysis
Solutions of the equation $ax+by=ab$
October 19th, 2020
number-theory
elementary-number-theory
Moving last digit to first
May 1st, 2020
recreational-mathematics
elementary-number-theory
Accuracy of Fermat's Little Theorem?
April 24th, 2020
modular-arithmetic
elementary-number-theory
Prove if a | b, then a | bc for all integers c ,true
November 8th, 2020
elementary-number-theory
divisibility
discrete-mathematics
Properties of the greatest common divisor: $\gcd(a, b) = \gcd(a, b-a)$ and $\gcd(a, b) = \gcd(a, b \text{ mod } a)$
August 1st, 2022
elementary-number-theory
discrete-mathematics
Learning square-and-multiply algorithm
October 10th, 2020
elementary-number-theory
Finding the largest 3-digit number $\; \overline{abc}\;$ s.t $\; \overline{abc}=100a+10b+c \equiv a+b^2+c^3$
February 23rd, 2020
diophantine-equations
elementary-number-theory
contest-math
The multiplicative group of integers mod n is cyclic iff ___.
August 1st, 2022
elementary-number-theory
abstract-algebra
group-theory
number-theory
How do you split a fraction into a sum of fractions?
April 27th, 2020
algebra-precalculus
elementary-number-theory
The product of any three consecutive natural numbers is divisible by 6
September 23rd, 2020
elementary-number-theory
Prove that if $a \mid bc$ then $a \mid b$ or $a \mid c$ for $a, b, c$ positive integers where a is not zero
April 22nd, 2020
divisibility
elementary-number-theory
How to quickly solve simple linear congruence equation
July 24th, 2020
elementary-number-theory
congruences
Remainder when a number is divided by its sum of the digits.
October 1st, 2020
elementary-number-theory
Solving mod problems
June 10th, 2020
elementary-number-theory
congruences
Should coprime numbers both be prime?
October 3rd, 2020
elementary-number-theory
prime-numbers
Question about proof involving prime numbers and divisibility
August 1st, 2022
elementary-number-theory
prime-numbers
Find the missing digit
September 25th, 2020
elementary-number-theory
What is meant by residue system and residue class in modular arithmetic?
August 1st, 2022
modular-arithmetic
definition
reduced-residue-system
elementary-number-theory
A divisibility rule for 19
August 21st, 2020
elementary-number-theory
divisibility
Find all integer solutions to $x^2-2y^2=1$
July 7th, 2021
number-theory
diophantine-equations
pell-type-equations
elementary-number-theory
If a certain number is divided by the sum of its two digits, how to find it from quotient and remainder?
April 1st, 2020
elementary-number-theory
algebra-precalculus
A natural number $n$ is prime if and only if, for all primes $p \le \sqrt n$, $p$ does not divide $n$.
February 8th, 2020
elementary-number-theory
Largest number with no repeated digits that is a multiple of each of its digits
October 12th, 2020
divisibility
elementary-number-theory
Given $(a,4)=2, (b,4)=2$, prove $(a+b,4)=4$
May 29th, 2020
proof-verification
elementary-number-theory
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