Have you realised that basically every number ending in the 3 is a prime number if the number before it is not a multiple of 3 (except for 343 and maybe some others)(this could also be wrong though)
+9665 All examples of composite numbers ending in 3 (1 - 500):
133 = 7 x 19
143 = 11 x 13
203 = 7 x 29
253 = 11 x 23
323 = 17 x 19
343 = 7 x 7 x 7
403 = 13 x 31
413 = 7 x 59
473 = 11 x 43
493 = 17 x 29
This should be changed:
All numbers under 100 and ending in 3 except multiples of 3 are prime numbers.
