SCIENCE said:

The Rev Dodgson said:

In all of mathematics, there are an infinite number of primes, but exactly 83 that work like Russian nesting dolls. 73,939,133 is the absolute end of the line.

It belongs to a highly exclusive club known as right-truncatable primes, and its unique property is a fascinating showcase of how prime numbers thin out as they get larger.

is it 83 in all bases with at least 9 digits

I doubt it, but I haven’t actually counted them.