Question

find the largest 7 digits no divisible by 2321

Answer 1

9 999 999 = 3^2 x 239 x 4649

9 999 998 = 2 x 4 999 999

9 999 997 = 7 x 1 428 571

9 999 996 = 2^2 x 3 x 191 x 4363 -> divisible by 12 !

9 999 995 = 5 x 17 x 71 x 1657   -> divisible by 17 & 71 two 2 digit primes and 85