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The largest and only multidigit prime factor in Harold
Smith's phone number (4937775). His brother-in-law (Albert
Wilansky of Lehigh University) was the first to notice that the sum of its
digits is equal to the sum of the digits in its prime
factors. Composite integers with this property are called Smith numbers.
To link to this page use http://primes.utm.edu/curios/page.php?number_id=6655
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