Find the sum of all four-digit numbers whose prime factors when added is a palindrome. For example, prime factors of 1006 is 2 and 503. The sum of these two numbers is 505 which is a palindrome. Keep in mind that the prime factors of 8 is 2, 2, and 2 instead of just 2.
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Last Solution submitted on Apr 17, 2026

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Pauli Huusari Riccardo G. Matthew Bolyard Lorenzo

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