perfectNumbers.js

/* eslint-disable */
import range from 'lodash/range'


// const r = range(1, 101)
const r = range(1, 10001)
const fromTo = to => range(2, to)


const simpleNumbers = r.reduce((memo, number) => {
  if (!fromTo(number).some(n => number % n === 0)) {
    return { ...memo, [number]: true }
  }

  return memo
}, {})

const getSimpleNumber = n => ({ computedValue: 2 ** n - 1, n })
const calculatedNumbers = r.map(getSimpleNumber)
const simpleNumbersReadyToBeauty = calculatedNumbers.filter(
  ({ computedValue }) => simpleNumbers[computedValue]
)
const beautyNumbers = simpleNumbersReadyToBeauty.map(({ computedValue, n }) => {
  return (2 ** (n - 1)) * computedValue
})


console.log({
  // simpleNumbers,
  // calculatedNumbers,
  // simpleNumbersReadyToBeauty,
  beautyNumbers,
})