# Description

A richly featured app for everything involving prime numbers.

Available utilities:

-Test numbers for primality.

-Calculate a number's unique prime factorization.

-List every divisor of a number.

-Generate a random prime, with the option to specify a range in which the prime is to be found.

-Browse through a complete list of the first 10,000 primes.

-Calculate pi(n), the prime counting function. This is the number of primes less than or equal to n.

-Calculate the greatest common divisor (GCD) of two numbers.

-Calculate the lowest common multiple (LCM) of two numbers.

-Find the value of Euler's totient function, phi(n). This is the number of positive integers less than or equal to n that are coprime to n.

Most features allow testing of numbers up to 9,999,999,999,999,999 (10^16 -1).

This app is completely free and is not ad supported.

You must install this app before submitting a review.

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# Reviews

Helpfulness

Newest

Rating

Helpfulness

All Versions

All Versions

Latest Version

4.7

60 total

5 47

4 9

3 3

2 0

1 1

A Google User

Very clean app, but I would also like a "largest prime less than" option to look at some neighbouring primes

A Google User

Best one Exactly what I was searching for.. It can do anything related to primes. Good job.

A Google User

Nice clean app

A Google User

Yay my birthday is a prime. Such a cool app

User reviews

Best one Exactly what I was searching for.. It can do anything related to primes. Good job.

Review deleted

# Additional information

Updated

January 24, 2011

Size

68k

Installs

5,000 - 10,000

Current Version

1.2

Requires Android

2.1 and up

Content Rating

Everyone

Permissions

Report

Flag as inappropriate Offered By

Alchemy

Developer

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※因数分解の過程（途中式）を解説する有料版《FactorizationSA》もあります。

※分数式の計算が必要な方のために《FracExpressionA》も用意しました。

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GK Apps

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This is a free mathematical calculator which is able to solve quadratic equations. The app is able to find both real and complex roots. Just enter the coefficients / parameters of the equation.

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Also i'd appreciate it if you rated this app.

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## Prime Factor Finder

A fast, flexible and powerful prime factorization app! Integers of up to 14 digits will be factorized very quickly (try 81000198000121 for example, or a strong pseudoprime such as 10000130243671). Integers of up to 20 digits are factorized within a few seconds in most cases.

(Please note: the Big Integer Calculator, also by this developer, includes this prime factorization algorithm, along with other features.)

The app uses Pollard's Rho algorithm to find factors of large integers, in combination with trial division optimized for speed when possible by interpreting sub-factors as long integers.

A menu button allows factorization calculations to be extended for faster devices. Pollard's Rho calculations are iterated more times when the depth in increased, which results in factorizing 'harder' numbers, but takes longer. The depth can also be reduced.

The app will accept arbitrarily large integers, and will find the prime factors of powers of 10 or other numbers with small factors very quickly. For example, if you calculate 3000! using some big integer calculator, and paste this number into the prime factor app, it will find the complete factorization in around ten seconds (Galaxy S4).

Integers with prime factors of seven or more digits will take longer to factorize, depending on the device the app is running on.

Progress is shown by listing factors as they are found. If a sub-factor which is known to be non-prime is taking a long time to factorize, the display will show "working ...". Calculation can be cancelled by pressing the back button on the device. However, if the app cannot find all the factors, it will terminate and list any factors it has found, rather than hanging or freezing.

## MATH/Factoring

speiris

1

This app finds the factors of Trinomial I, Trinomial II and Difference of two squares. A step by step explanation is also included. This can find only real factors. If the factors are complex a message will be displayed.

Instructions:

All the coefficients need to be entered.

If a coefficient is 1 need to enter 1.

If a coefficient is negative, the number should be entered with the negative sign (e.g., -3).