Discovery of the day:

A Brazilian number \(n\) is an integer whose base–\(b\) representation has all the same digits for some \(1< b < n−1\).

Extracted from [1].

[1] Brazilian Primes Which Are Also Sophie Germain Primes, https://arxiv.org/pdf/1903.04577.pdf

Refurio Anachro@RefurioAnachro@mastodon.cloudOEIS says a Brazilian number is...

> numbers n such that there is a natural number b with 1 < b < n-1 such that the representation of n in base b has all equal digits.

https://oeis.org/A125134

I don't know what my problem is, erou had used almost the same wording, but I found myself incapable to get it.

For even more fun, try this search instead:

https://oeis.org/search?q=brazilian+number&sort=&language=&go=Search

Nice find, @erou, thanks!

#maths