Recreational_Number_Theory

A Javascript library for quick calculations of different properties of numbers.

Installation

npm i recnum --save

or

yarn add recnum

Usage

Javascript

const recnum = require("recnum");

Typescript

import * as recnum from 'recnum';

Check if a number is prime

const recnum = require("recnum")
recnum.isPrime(7); // return: True
recnum.isPrime(12); // returns: False

Check if a number is perfect

recnum.isPerfect(6) // returns: True

List of all properties of numbers

recnum.isEven(5)
recnum.isPrime(5)
recnum.isEmirp(5)
recnum.isSuperPrime(5)
recnum.isTwinPrime(5)
recnum.isWilsonPrime(5)
recnum.isAbundant(5)
recnum.isPerfect(5)
recnum.isDefiecnt(5)
recnum.isKeith(5)
recnum.isHappy(5)
recnum.isPolyDivisible(5)
recnum.isNarcissistic(5)
recnum.isSmith(5)
recnum.isAutomorphic(5)
recnum.isAchilles(5)
recnum.isMersenne(5)
recnum.isFermat(5)
recnum.isPowerful(5)
recnum.ieOre(5)
recnum.isSphenic(5)
recnum.isKaprekar(5)
recnum.isHarshad(5)
recnum.isPronic(5)

Find if a number is in the a Sequence Will return index of number in sequence

recnum.inFib(5) // returns: 5
recnum.inLucas(5)
recnum.inPadovan(5)
recnum.inJacobsthal(5)
recnum.inLeonardo(5)
recnum.inCatalan(5)
recnum.inLookAndSay(5)
recnum.inLazyCaterers(5)

Other Useful Things

• Get all the primes up to a number (primesUpTo)
• See if the number is a power of another (powers)
• Find a number's factors (factors)
• Find a number's prime factors (primeFactors)
• Find a number's sum of factors (factorSum)
• Convert a number to roman numerals (toRomanNumeral)

If you have any other fun number types that you think this should include just make a PR and I'll add them!