Markus Sigg

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20182023

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math.CO2023

A note on OEIS sequence A111384

Markus Sigg

$A 111384 (n)$ is an upper bound for the number of primes that can be written as a sum of three distinct primes selected from a set of $n$ primes. Is this bound sharp?

math.CO2018

Gasper's determinant theorem, revisited

Markus Sigg

Let $n \geq 2$ be a natural number, $M$ a real $n \times n$ matrix, $s$ the sum of the entries of $M$ and $q$ the sum of their squares. With $α := s / n$ and $β := q / n$ , Gasper's determ…