Suppose that you want to find all two and three digit primes where allof the component digits are also prime (eg, 37 would qualify but 41would not, since 4 is not prime).

Here is the simple Unix approach:

factor $(seq 10 999) | awk 'NF == 2 {print $2}' | egrep '^[12357]*$'

(I won't claim that this is obvious until you're immersed

As I mentioned in a recent entry , Flash hasbeen broken for me for all of Fedora 11 on my 64-bit machine. Thecomments on my entry caused me to dig into the situation, and aftersome experimentation (building a fresh installed 64-bit Fedora 11 ina virtual machine to see if Flash worked, which it did), I found myproblem and now have working Flash.

In fact, I found the problem doing what I should have done in the firstplace;