Question: Closest Prime Number

This is from Introduction To Maple by Andre Heck page 63, exercise 4(b): "with(numtheory); ... Find the prime number that is closest to 9876543210123456789." Here is a solution that does not use numtheory: View 4937_IntroductionToMaplePage63Exercise4b.mw on MapleNet or Download 4937_IntroductionToMaplePage63Exercise4b.mw
View file details I'd like to see better solutions, some that use numtheory.
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