ee1e8abd87
* feat(tools): add seed/solution restore script * chore(curriculum): remove empty sections' markers * chore(curriculum): add seed + solution to Chinese * chore: remove old formatter * fix: update getChallenges parse translated challenges separately, without reference to the source * chore(curriculum): add dashedName to English * chore(curriculum): add dashedName to Chinese * refactor: remove unused challenge property 'name' * fix: relax dashedName requirement * fix: stray tag Remove stray `pre` tag from challenge file. Signed-off-by: nhcarrigan <nhcarrigan@gmail.com> Co-authored-by: nhcarrigan <nhcarrigan@gmail.com>
45 lines
786 B
Markdown
45 lines
786 B
Markdown
---
|
|
id: 5900f5271000cf542c510039
|
|
title: 'Problem 442: Eleven-free integers'
|
|
challengeType: 5
|
|
forumTopicId: 302114
|
|
dashedName: problem-442-eleven-free-integers
|
|
---
|
|
|
|
# --description--
|
|
|
|
An integer is called eleven-free if its decimal expansion does not contain any substring representing a power of 11 except 1.
|
|
|
|
For example, 2404 and 13431 are eleven-free, while 911 and 4121331 are not.
|
|
|
|
Let E(n) be the nth positive eleven-free integer. For example, E(3) = 3, E(200) = 213 and E(500 000) = 531563.
|
|
|
|
Find E(1018).
|
|
|
|
# --hints--
|
|
|
|
`euler442()` should return 1295552661530920200.
|
|
|
|
```js
|
|
assert.strictEqual(euler442(), 1295552661530920200);
|
|
```
|
|
|
|
# --seed--
|
|
|
|
## --seed-contents--
|
|
|
|
```js
|
|
function euler442() {
|
|
|
|
return true;
|
|
}
|
|
|
|
euler442();
|
|
```
|
|
|
|
# --solutions--
|
|
|
|
```js
|
|
// solution required
|
|
```
|