Find the smallest 5 digit positive integer that
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x m o d 8 ≡ 2 ⟹ x = 8 k + 2 = 7 2 q + 3 4 x m o d 9 ≡ 7 ⟹ x = 9 a − 2 = 7 2 q + 3 4 = 7 2 ( 7 + 1 1 w ) + 3 4 = 5 3 8 + 7 9 2 w
8 k + 4 = 9 a ⟹ k = 4 , a = 4 ⟹ k = 4 + 9 q , a = 4 + 8 q
x mod 11 = 10 => x = 11s-1 => 11s = 72q+35 => (11s mod 11) = (72q mod 11) + (35 mod 11) => 0 = -5q mod 11 + 2 mod 11 => 5q mod 11 = 2 mod 11 = (11c+2) mod 11 => 5q = 11c + 2 => c = 3, q = 7 => q = 7+11w , c = 3+5w
538 + 792w > 10,000 => 792w > 9462 => w > 11 => min(w) = 12 => min(5 digit number) = 538 + (792*12) = 10,042