Unless you understand the beauty of Prime numbers, you won’t run behind

them. Well, I leave it as an exercise for the reader to find their beauty. To get a

feel of how important Primes are, try writing a simple code to find if the given

number is Prime [Wisely choose your algorithm!]. Now, put a massive Prime

number (Yes, you can use the web to find these massive primes) having 20

digits and see what your code returns. If at all you perform this exercise

[though imaginary], I assume that you have got some insight into what I’m

trying to convince.

So, the principle which we use in our welfare is that Prime numbers do

not have any factors other than themselves! Thus, if you have a pair of 20-30

digit Primes then you may multiply them and use it to encrypt your data, and let

the intruder take years to find your data. I won’t go into details of encryption,

for it will make us deviate from the title.

If you have used the Euclid’s algorithm (Which reduces the complexity from

O (n) to O () for the primality search and if you have an inquisitive mind then

you may ask: Are there any more such algorithms? I’m glad you asked! And

I’m blushing here to explain them. You may refer, as I did, to the ‘so-called’

Black Bible of the Primes by my favourite author, Richard Crandall which bears

the name same as the title of this very article. Years before, Dr. Mahindra

Agarwal, a professor at IIT, Kanpur invented an algorithm which is proved to

have minimum complexity until now! With his two Ph. D students who

completed their Ph. D within 2 months!! What I want to highlight here is, as the

community over which this article aims is having some computational

background, I encourage them to work out these algorithms. One can use the

Parallel Programming approach (in some tests like the famous Lucas-Lehmer

test for Merssene Primes). This field is so much into work these days, see the

Bitcoin, the mining of these is rests its basement on Primes!.

If you are a student of Mathematics or not, it is a truth that Mathematics is a

tool, I say, in analyzing every physical phenomenon. If you know to use it well,

force is with you! If you don’t know to use it, say hello!!

The above article is just a crude description of what computational mathematics

aims at. To get a hands-on experience into it, I suggest referring following

resources.

1. https://www.youtube.com/watch?v=lEvXcTYqtKU

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Very energetic and encouraging article. Good job Urvish.