freeCodeCamp/problem-36-double-base-palindromes.english.md at ef79ddd0de35a4e10b8b4588e67938f86d2bae10

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mrugesh 22afc2a0ca feat(learn): python certification projects (#38216 )

Co-authored-by: Oliver Eyton-Williams <ojeytonwilliams@gmail.com>
Co-authored-by: Kristofer Koishigawa <scissorsneedfoodtoo@gmail.com>
Co-authored-by: Beau Carnes <beaucarnes@gmail.com>

2020-05-27 13:19:08 +05:30

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Raw Blame History

id, challengeType, isHidden, title, forumTopicId

id	challengeType	isHidden	title	forumTopicId
5900f3901000cf542c50fea3	5	false	Problem 36: Double-base palindromes	302020

Description

The decimal number, 585 = 1001001001₂ (binary), is palindromic in both bases.

Find the sum of all numbers, less than n, whereas 1000 ≤ n ≤ 1000000, which are palindromic in base 10 and base 2.

(Please note that the palindromic number, in either base, may not include leading zeros.)

Instructions

Tests

tests:
  - text: <code>doubleBasePalindromes(1000)</code> should return a number.
    testString: assert(typeof doubleBasePalindromes(1000) === 'number');
  - text: <code>doubleBasePalindromes(1000)</code> should return 1772.
    testString: assert(doubleBasePalindromes(1000) == 1772);
  - text: <code>doubleBasePalindromes(50000)</code> should return 105795.
    testString: assert(doubleBasePalindromes(50000) == 105795);
  - text: <code>doubleBasePalindromes(500000)</code> should return 286602.
    testString: assert(doubleBasePalindromes(500000) == 286602);
  - text: <code>doubleBasePalindromes(1000000)</code> should return 872187.
    testString: assert(doubleBasePalindromes(1000000) == 872187);

Challenge Seed

function doubleBasePalindromes(n) {
  // Good luck!
  return n;
}

doubleBasePalindromes(1000000);

Solution

// solution required

1.6 KiB Raw Blame History