997 B
997 B
id | title | challengeType | forumTopicId | dashedName |
---|---|---|---|---|
5900f4021000cf542c50ff14 | Problem 148: Exploring Pascal's triangle | 5 | 301777 | problem-148-exploring-pascals-triangle |
--description--
We can easily verify that none of the entries in the first seven rows of Pascal's triangle are divisible by 7:
1 1 1 1 2 1 1 3 3 1 1 4 6 4 1 1 5 10 10 5 1 1 6 15 20 15 6 1
However, if we check the first one hundred rows, we will find that only 2361 of the 5050 entries are not divisible by 7.
--instructions--
Find the number of entries which are not divisible by 7 in the first one billion (109) rows of Pascal's triangle.
--hints--
euler148()
should return 2129970655314432.
assert.strictEqual(euler148(), 2129970655314432);
--seed--
--seed-contents--
function euler148() {
return true;
}
euler148();
--solutions--
// solution required