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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

+ 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.

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