That what I understood. It's interesting. After the second step in your example, they are congruent with 3 modulo 11, but I'm not sure if it's just a coincidenc

That what I understood. It's interesting. After the second step in your example, they are congruent with 3 modulo 11, but I'm not sure if it's just a coincidence... Anyway, I think that if you copy this to a new entry in your blog and then post it here, it may get traction and hopefully an answer.