67 lines
1.2 KiB
Markdown
67 lines
1.2 KiB
Markdown
---
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id: 5900f3901000cf542c50fea3
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title: 'Problem 36: Double-base palindromes'
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challengeType: 5
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forumTopicId: 302020
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dashedName: problem-36-double-base-palindromes
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---
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# --description--
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The decimal number, 585 = 1001001001<sub>2</sub> (binary), is palindromic in both bases.
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Find the sum of all numbers, less than `n`, whereas 1000 ≤ `n` ≤ 1000000, which are palindromic in base 10 and base 2.
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(Please note that the palindromic number, in either base, may not include leading zeros.)
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# --hints--
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`doubleBasePalindromes(1000)` should return a number.
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```js
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assert(typeof doubleBasePalindromes(1000) === 'number');
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```
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`doubleBasePalindromes(1000)` should return 1772.
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```js
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assert(doubleBasePalindromes(1000) == 1772);
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```
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`doubleBasePalindromes(50000)` should return 105795.
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```js
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assert(doubleBasePalindromes(50000) == 105795);
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```
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`doubleBasePalindromes(500000)` should return 286602.
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```js
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assert(doubleBasePalindromes(500000) == 286602);
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```
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`doubleBasePalindromes(1000000)` should return 872187.
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```js
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assert(doubleBasePalindromes(1000000) == 872187);
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```
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# --seed--
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## --seed-contents--
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```js
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function doubleBasePalindromes(n) {
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return n;
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}
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doubleBasePalindromes(1000000);
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```
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# --solutions--
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```js
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// solution required
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```
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