"Leudesdorf has proved that for a positive integer n coprime to 6" https://en.wikipedia.org/wiki/Wolstenholme%27s_theorem#Generalizations https://en.wikipedia.

"Leudesdorf has proved that for a positive integer n coprime to 6" https://en.wikipedia.org/wiki/Wolstenholme%27s_theorem#Generalizations https://en.wikipedia.org/wiki/Wolstenholme%27s_theorem#Gener...