← RoseCodeROSECODE / 259Matchsticks primePhilippe_57721 · Programming · 2015-08-22Using 20 matchsticks, we can write the following prime number: How may different prime numbers can you write using exactly 20 matchsticks? [My timing: < 200 ms] N.B: Non significative 0s are not allowed, thus: 0019 is not valid.