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15
143
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Solving the number theoretic equation $ \sum_{d|n}{d^4}=n^4+n^3+n^2+n+1 $

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#number-theory #contest-math #divisor-sum
876
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Question on division and remainder

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#divisor-sum
449
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Is this a good generating function for Sum-of-divisors function?

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#number-theory #elementary-number-theory #modular-arithmetic #trigonometric-series #divisor-sum
383
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Number of divisors $d$ of $n^2$ so that $d\nmid n$ and $d>n$

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#combinatorics #number-theory #contest-math #divisibility #divisor-sum
90
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A number-theory question on the deficiency function $2x - \sigma(x)$

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#number-theory #elementary-number-theory #analytic-number-theory #conjectures #divisor-sum
222
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A mixture with ingredients of two equivalences with Riemann Hypothesis

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#integral-inequality #conjectures #divisor-sum #riemann-hypothesis
93
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A follow-up number-theory question on the deficiency function $D(x) = 2x - \sigma(x)$

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#elementary-number-theory #divisor-sum #multiplicative-function
214
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Finding a specific number whose divisors exceed a fixed value.

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#divisor-sum
20
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How to express this sum of certain non-divisors in a different form?

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#summation #divisor-sum
128
Views

Does OEIS sequence A059046 contain any odd squares $u^2$, with $\omega(u) \geq 2$?

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#elementary-number-theory #divisor-sum #oeis
732
Views

Improvement on $\phi(n)\sigma(n)/n^2$ bounds?

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#number-theory #totient-function #divisor-sum
92
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Is $\frac{4x^2 - 1}{3x^2}$ an abundancy outlaw?

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#elementary-number-theory #divisor-sum
76
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sum of digits = sum of factors

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#sequences-and-series #recreational-mathematics #divisor-sum
171
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Is the odd part of even almost perfect numbers (other than the powers of two) not almost perfect?

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#elementary-number-theory #proof-verification #divisor-sum #perfect-numbers
216
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Does the following equation have any solutions in $\mathbb{N}$?

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#elementary-number-theory #conjectures #divisor-sum

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