Happy 5th birthday, Cody! Since 5 is a prime number, let's have some fun looking for other prime numbers.
Given a positive integer x, find the nearest prime number. Keep in mind that the nearest prime may be less than x.
Examples
nearestprime(5) = 5 nearestprime(36) = 37 nearestprime(200) = 199
NOTE: You may ignore cases in which two prime numbers are equally close to x. (e.g., x=12 --> 11 and 13 are both primes).
Solution Stats
Problem Comments
-
1 Comment
Tran Hiep Dinh
on 21 Mar 2019 at 3:06
Test case No. 5
x = 911;
y_correct = 911;
Should the nearest prime number for 911 have been 907?
Solution Comments
-
1 Comment
Francis Naldo
on 29 Dec 2017
Look. It's Size 80
-
1 Comment
Igor Gaponov
on 21 Dec 2017
I feel for you, typing in those endless arrays of prime numbers.
You have probably figured it out by now, but instead of typing in manually the vectors prim0 and prim1 and then checking memberships, you can just run the function 'isprime(x)' which will save you lots of space and time
Recent Solvers393
Suggested Problems
-
Program an exclusive OR operation with logical operators
574 Solvers
-
How long is the longest prime diagonal?
255 Solvers
-
Who is the smartest MATLAB programmer?
434 Solvers
-
240 Solvers
-
392 Solvers
More from this Author46
Tags
Discover what MATLAB® can do for your career.
Opportunities for recent engineering grads.
Apply Today