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Answer to Question #36509 in Combinatorics | Number Theory for Quamrul islam

Question #36509
The number 3797 has an interesting property.Being prime itself,it is possible to continuously remove digits from left to right,and remain prime at each stage: 3797, 797, 97, and 7. Similarly we can work from right to left: 3797, 379, 37, and 3. Find the only four-digit prime number with this property.
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