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Challenge #79: Find the Closest Prime Number

Jean-Balteryx
16 - Nebula
16 - Nebula

Here is my solution !

phottovy
13 - Pulsar
13 - Pulsar

Really curious to see how others completed this one:

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danuliatko
7 - Meteor

My solution attached - i am sure it can be done more quickly

JethroChen
10 - Fireball
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HarrisonHolt
7 - Meteor

wc79

ehughes
9 - Comet

Really nice challenge

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AkimasaKajitani
17 - Castor
17 - Castor

My solution.

 

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1. Calculate the Lower Prime Number
2. Calculate the diff between Lower Prime Number and Number.
3. Calculate the Upper Prime Number between Number and Number+diff.
4. Select the Prime Number that have most minimum diff.  

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Qiu
21 - Polaris
21 - Polaris

Very interesting

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Hitch
8 - Asteroid

Here's my attempt

A2H
11 - Bolide

This solution works also for large numbers!

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