const chars = 'abcdehlkmrtwxyz3469'.toUpperCase()
// const i = 19880108151231
const i = 1002558
console.log(i)
const to = (decimal) => {
let out = ''
while (true) {
let remainder = (decimal - 1) % chars.length
out = chars[remainder] + out;
decimal = Math.floor((decimal - 1) / chars.length);
if (decimal === 0) break
}
return out;
}
let t = to(i)
console.log(i + ' (' + to(i % 13) + ') ' + t)
console.log('eg. \'' + i + '.' + to(i % 13) + t + '\'')
const from = (alpha) => {
const crs = chars.split('')
const letters = alpha.split('')
let out = 0
for (let i = 0; i < letters.length; i++) {
let indexPos = crs.indexOf(letters[letters.length - 1 - i])
out += (indexPos + 1) * Math.pow(crs.length, i)
}
return out
}
let f = from(t)
console.log(t + ' = ' + f + ' (' + to(f % 13) + ')')
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