Logic Masters Deutschland e.V.

Kro-coprime-pki: A version of kropki that involves arithmetic

Rules:

Normal Sudoku rules apply.

Cells separated by any dot contain digits whose gcd (greatest common divisor) is strictly larger than 1.

In cells separated by red dots, one of the digits must divide the other. In cells separated by green dots, neither of the digits divides the other.

All such possible dots are provided.

On thermometers, digits must increase from the bulb end.

Puzzle:

Try the puzzle here.