3 ms·
Based on my failure at this game, anything times 19 looks prime to me.
by jcims 5y ago
Based on my failure at this game, anything times 19 looks prime to me.
- Dylan16807 5y agoWell you only have 4 of those under 100. The "looks prime" rule assumes you check for multiples of 3, so that removes one. All the rest end in an even digit or 5.
- jcims 5y agoyeah once i started doing the trick for 3's the whole thing got boringly easy