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Finding last digits

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#modular-arithmetic #integers #decimal-expansion
1.1k
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Prove that if $d$ is a common divisor of $a$ and $b$, then $\gcd(a,b)/d = \gcd(a/d,b/d)$.

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#elementary-number-theory #integers
236
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$n$ as an integer and a real number

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#definition #real-numbers #integers #rational-numbers
234
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Distance between multisets of integers

Published on
#geometry #integers
58
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Analyze if $(a+b)^{m} \equiv a^{m}+b^{m} \pmod {m}$

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#elementary-number-theory #modular-arithmetic #integers
148
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For how many $n < N$ is $d(n) \equiv 0 \pmod p$?

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#number-theory #modular-arithmetic #factoring #integers
580
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Product of 3 consecutive even integers is 87*****8. Find missing digits without a calculator?

Published on
#integers
59
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how to find three positive integers $\mathbf a, \mathbf b, \mathbf a+\mathbf b$ each can be write as a sum of two squares

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#number-theory #integers
292
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Yun's algorithm and integers

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#abstract-algebra #polynomials #factoring #integers
195
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Prove that there are no non-zero integers $m$ and $n$ such that $m^2 = 180 n^4$

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#elementary-number-theory #divisibility #integers
71
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Problem using binominal theorem?

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#elementary-number-theory #binomial-theorem #integers #natural-numbers
81
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What is the exact limit of $a_n=-\frac1e+e^{(\frac1e)^{...^{\frac{1}{e^n}}}}$ for $n \to \infty$

Published on
#sequences-and-series #limits #integers
53
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Multiplication of medium sized integers

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#algorithms #integers #computer-arithmetic
142
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Checkerboard Problem

Published on
#summation #problem-solving #integers
507
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How do I find the number of integer solutions ($x,y$) that satisfy the equation $y = 3x^2 + 7xy + 4y^2$?

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#quadratics #integers

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