The number 63 has the prime factorization 3, 3, and 7, and it contains one of them (3) as a substring. In contrast, the number 48 has unique prime factors of 2 and 3, and neither appears as a substring in 48.
Write a function that takes a number n and produces the nth term in this sequence. For example, 48 is the 16th term.
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Last Solution submitted on Jul 25, 2025

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Tim William David Hill Matthew Bolyard

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