Leif Schaumann

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math.NT2025

On SierpiÅski and Riesel Repdigits and Repintegers

Chris Bispels, Matthew Cohen, Joshua Harrington +4

For positive integers $b \geq 2$ , $k < b$ , and $t$ , we say that an integer $k_{b}^{(t)}$ is a $b$ -repdigit if $k_{b}^{(t)}$ can be expressed as the digit $k$ repeated $t$ times in base-$b…

math.NT2025

A further investigation on covering systems with odd moduli

Chris Bispels, Matthew Cohen, Joshua Harrington +4

ErdÅs first introduced the idea of covering systems in 1950. Since then, much of the work in this area has concentrated on identifying covering systems that meet specific conditio…

On SierpiÅski and Riesel Repdigits and Repintegers

A further investigation on covering systems with odd moduli

On SierpiÅski and Riesel Repdigits and Repintegers