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15

수 목록 - 정수
<< 10 11 12 13 14 15 16 17 18 19 >>
<< 0 10 20 30 40 50 60 70 80 90 >>
읽는 법 십오
세는 법 열다섯
한자 十五
소인수 분해 3×5
로마 숫자 XV
2진수 1111
8진수 17
12진수 13
16진수 F
수학적 성질
φ(15) = 8 σ*(15) = 24
d(15) = 4 σ(15) = 24
μ(15) = 1 M(15) = -1

15(십오)는 14보다 크고 16보다 작은 자연수이다.

수학

과학

나이(만 15세)

  • 15세는 논어 위정편 가운데 "열다섯에 학문에 뜻을 두었다(十有五而志于學)"라는 구절을 인용하여 지우학이라고도 한다.
  • 옛날 조선시대 때에는 이 나이에 남성댕기를 땋은 머리를 잘라 상투를 틀고, 여성댕기를 땋은 머리를 풀러 을 찌고 비녀를 꽂았다.
  • 대한민국의 방송물 등급인 만 15세 이상 관람가의 기준이 되는 나이

스포츠

기타

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