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Zach’s POTW

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A reverse prime is a positive integer whose digits read in reverse order form a prime number. The problem asks to find the largest two-digit integer N such that N, 4N, and 5N are all reverse primes.

Zach’s POTW1/30 - 2/6

Define a reverse prime to be a positive integer N such that when the digits of N are read in reverse order, the resulting number is a prime. For example, the numbers 5, 16, and 110 are all reverse primes. Compute the largest two-digit integer N such that the numbers N, 4N, and 5N are all reverse primes.

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Zach’s POTW

1. Zach’s POTW1/30 - 2/6

2. Define a reverse prime to be a positive integer N such that when the digits of N are read in reverse order, the resulting number is a prime. For example, the numbers 5, 16, and 110 are all reverse primes. Compute the largest two-digit integer N such that the numbers N, 4N, and 5N are all reverse primes.