Oliver Eyton-Williams 0bd52f8bd1

and change all the challenges to new `md` format.

2020-11-27 10:02:05 -08:00

843 B

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id, title, challengeType, forumTopicId

id	title	challengeType	forumTopicId
5900f3fd1000cf542c50ff10	Problem 145: How many reversible numbers are there below one-billion?	5	301774

--description--

Some positive integers n have the property that the sum [ n + reverse(n) ] consists entirely of odd (decimal) digits. For instance, 36 + 63 = 99 and 409 + 904 = 1313. We will call such numbers reversible; so 36, 63, 409, and 904 are reversible. Leading zeroes are not allowed in either n or reverse(n).

There are 120 reversible numbers below one-thousand.

How many reversible numbers are there below one-billion (109)?

--hints--

euler145() should return 608720.

assert.strictEqual(euler145(), 608720);

--seed--

--seed-contents--

function euler145() {

  return true;
}

euler145();

--solutions--

// solution required

843 B Raw Blame History