I'm addicted O.O
Reviews for "Prime"
Okay, this is excellent!
This is a very good mathematics exercise and tester and you actually can learn something by playing it. Those higher numbers are very hard to figure out. This game is great training exercise and I'm sure one could actually get better over time at spotting factors playing this!
Well this was interesting and some math required lol no but its a fun lil game you have here some nice elements of math and quiz like game, I do like the quiz of it and the puzzle element of all the math style anyways nice job
~X~
Quite nice. It would be nice if the solution would be shown on failure.
And some help to others:
It is divisible by x if:
2: Last digit is 0, 2, 4, 6 or 8.
3: Sum of digits is divisible by 3. 321 is divisible by 3 since 3+2+1=6, which also is.
5: Last digit is 0 or 5.
7: Remove last digit. Multiply that digit by 2 and subtract from the remainder. If result is divisible by 7, then the original number is. 7791 is divisible by 7 because 779-(2*1)=777 is.
11: Take first digit. Subtract the next. Add the next. Subtract the next and so on. If result is divisible by 11, then the original number is. 50919 is divisible by 11, since 5-0+9-1+9=22 is.
13: Same as 7, but multiply by 4 instead of 2, and add instead of subtract. 1183 is divisible by 13 since 118+(4*3)=130 is.
17: Same as 7 and 13 but subtract 5 times the last digit.
19: Same as 7, 13 and 17 but add 2 times the last digit.
Good practice, but it gets a bit boring after a while.