Prime of Primes

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Problem statement : Team Cypher decided to organize a competition CYPHER September with the help of Code Chef. While two of its members were sitting in the classroom they came up with a question to find all those prime numbers from L to R whose every individual digit is a prime number. Other two of its members found out the solution but unfortunately it was not very efficient.Eventually one of it

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L1 Observation

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solution.cppC++17

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