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Function: require_once
수학동아 - 폴리매스
함께 풀고 싶은 문제
나도 수학쌤 문장제 문제를 변형해 문제를 내는 곳입니다.
[문장제 문제&개념응용] 자릿수가 그 자체의 개수인 수
원파
2021.01.21 09:47
조회 375
어떤 정수 N은 자릿수가 그 자체의 개수인 수이다.
자릿수가 그 자체의 개수인 수란,
만약 한 자리가 p라면 p...p 와 같이 p개의 p가 된다.
그렇게 p개의 자리가 채워지면, 그 다음에 또 다른 q에 대해 같은 방법으로 자리를 채운다.
그 다음에는 r, s 등등 계속해서 자리를 채운다.
자릿수가 그 자체의 개수인 수의 예시는 1122, 33344441, 55555111 등이 있다.
자릿수가 그 자체의 개수인 수의 바르지 않은 예시는 1222, 4443331, 5555519 등이 있다.
여덟자리 수 N의 개수는?
지금 바로
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