1.6 KiB
1.6 KiB
id | challengeType | title |
---|---|---|
5900f3a01000cf542c50feb3 | 5 | Problem 52: Permuted multiples |
Description
Instructions
Tests
tests:
- text: <code>permutedMultiples()</code> should return 142857.
testString: assert.strictEqual(permutedMultiples(), 142857, '<code>permutedMultiples()</code> should return 142857.');
Challenge Seed
function permutedMultiples() {
// Good luck!
return true;
}
permutedMultiples();
Solution
function permutedMultiples() {
const isPermutation = (a, b) =>
a.length !== b.length
? false
: a.split('').sort().join() === b.split('').sort().join();
let start = 1;
let found = false;
let result = 0;
while (!found) {
start *= 10;
for (let i = start; i < start * 10 / 6; i++) {
found = true;
for (let j = 2; j <= 6; j++) {
if (!isPermutation(i + '', j * i + '')) {
found = false;
break;
}
}
if (found) {
result = i;
break;
}
}
}
return result;
}