Brazilian numbers and prime numbers

Authors

  • Jaromír Šimša Faculty of Science, Masaryk University, Brno

Abstract

The article deals with the so-called Brazilian numbers, natural numbers that can be written in a certain positional system using the same digits. An example of a Brazilian number is 2000, which can be written as 5555 in a base-7 system. The main part of the paper is devoted to the formal definition of Brazilian numbers and their properties. Next, proofs of several theorems are given, such as that all even numbers greater than 6 are Brazilian and that all odd numbers greater than 5 are Brazilian except for some prime numbers and squares of prime numbers. The paper also states that the only prime number p for which p^2 is Brazilian is 11. It concludes by addressing questions that still have no answers, such as whether there are infinitely many Brazilian primes.

Published

2024-12-01

How to Cite

Šimša, J. (2024). Brazilian numbers and prime numbers. MATHEMATICS–PHYSICS–INFORMATICS, 33(4), 241–246. Retrieved from https://mfi.upol.cz/index.php/mfi/article/view/857

Issue

Section

Mathematics