A Javascript library for quick calculations of different properties of numbers.
npm i recnum --save
or
yarn add recnum
const recnum = require("recnum");
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!