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AMC 12 2005a Problem 18

  • Paper

Call a number "prime-looking" if it is composite but not divisible by 22, 33, or 55. The three smallest prime-looking numbers are 4949, 7777, and 9191. There are 168168 prime numbers less than 10001000. How many prime-looking numbers are there less than 10001000?

(A) 100(B) 102(C) 104(D) 106(E) 108\textbf{(A) } 100 \textbf{(B) } 102 \textbf{(C) } 104 \textbf{(D) } 106 \textbf{(E) } 108

Dataset text AMC 12 2000 to 2025. Quoted with source.

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