problem 17 definition
thousands, ones
tests and range extension
describe range
and-count
more tests, 18 fix
adding position check for special cases 11+
ignoring tilde files, adding problem 7
finding the 10001th prime
stub
digit summer
counting primes up to two million
circular primes, problem 34
pandigital method, to_a method, solved problem 34
solving problem 41, but not efficiently
beginning of sieve
sieve test
sieve test improve
solving problem 41 using sieve, running into memory allocation problems
sieve test