Problem 981. Find nearest prime number less than input number

Solution 1446399

Submitted on 22 Feb 2018 by John D'Errico

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Test	Status	Code Input and Output
1	Pass	n = 127; y_correct = 113; assert(isequal(minorprime(n),y_correct))
2	Pass	n = 125; y_correct = 113; assert(isequal(minorprime(n),y_correct))
3	Pass	n = 3; y_correct = 2; assert(isequal(minorprime(n),y_correct))
4	Pass	n = 2; y_correct = []; assert(isequal(minorprime(n),y_correct))
5	Pass	n = 1328; y_correct = 1327; assert(isequal(minorprime(n),y_correct))
6	Pass	n = 5050109; y_correct = 5050099; assert(isequal(minorprime(n),y_correct))
7	Pass	pn = primes(1e6); ind = max(100,floor(numel(pn)*rand)); n = pn(ind) - 1; y_correct = pn(ind - 1); assert(isequal(minorprime(n),y_correct))

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