Given the series of prime numbers greater than $9$, we organize them in four rows, according to their last digit ($1,3,7$ or $9$). The column in which they are displayed is the ten to which they belong, as illustrated in the following scheme.
My conjecture is:
Given any two primes (i.e. given any two points in the above scheme), it is always possible to find a circle passing through at least other two points, representing other two primes.
Here I present some examples, taking two random points. Sorry for the bad quality of the picture.
Since I am not an expert of prime numbers, this can be an obvious result (if true, of course). In this case, I apologize for the trivial question.
However, I tried to attack the problem by means of the equation of the circle, but I got lost. Thanks for your help!