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Previous Prime Number

Tool to search for prime numbers less than a number, or the nth previous prime number of a given number.

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Previous Prime Number -

Tag(s) : Arithmetics, Mathematics

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Previous Prime Number

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Previous Prime Number Search



Tool to search for prime numbers less than a number, or the nth previous prime number of a given number.

Answers to Questions

How to calculate the previous prime number?

No mathematical formula is used to automatically calculate the prime number preceding any number. dCode perform primality testshref on numbers below the requested number until a prime number is found.

Example: The largest prime number that precedes 100 is 97

Example: The 10th prime number preceding 1000 is 937 (so there are 9 prime numbers between 938 and 999)

The number must be a positive real numberhref.

How to find greatest primes with n digits ?

The first prime number preceding \( 10^n \) is a number with \( n \) digits which is the greast n-digit prime number.

Example: 7, 97, 997, 9973, 99991, etc.

What are twin primes numbers?

A prime number and the previous prime number are twins primes when their difference equals 2.

Example: 11 and 13 are called twins primes as 13-11 = 2.

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Source code

dCode retains ownership of the source code of the script Previous Prime Number online. Except explicit open source licence (indicated Creative Commons / free), any algorithm, applet, snippet, software (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any function (convert, solve, decrypt, encrypt, decipher, cipher, decode, code, translate) written in any informatic langauge (PHP, Java, C#, Python, Javascript, etc.) which dCode owns rights can be transferred after sales quote. So if you need to download the online Previous Prime Number script for offline use, for you, your company or association, see you on contact page !

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