Функция Эйлера (теочисел)
Flashcard
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Mathematics
•
University
•
Practice Problem
•
Hard
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1.
FLASHCARD QUESTION
Front
Что такое функция Эйлера φ(n)?
Back
Функция Эйлера φ(n) определяет количество положительных целых чисел, меньших n и взаимно простых с n.
2.
FLASHCARD QUESTION
Front
Как вычислить φ(p), если p — простое число?
Back
φ(p) = p - 1, так как все числа от 1 до p-1 взаимно просты с p.
3.
FLASHCARD QUESTION
Front
Какова формула для суммы всех чисел, меньших n и взаимно простых с n?
Back
Сумма = n * φ(n) / 2.
4.
FLASHCARD QUESTION
Front
Какова сумма значений функции Эйлера для всех делителей числа 30?
Back
Сумма значений φ(d) для всех делителей d числа 30 равна 36.
5.
FLASHCARD QUESTION
Front
Каково значение φ(11)?
Back
φ(11) = 10, так как 11 — простое число.
6.
FLASHCARD QUESTION
Front
Каково значение φ(8)?
Back
φ(8) = 4, так как делители 8: 1, 2, 4, 8, и взаимно простые с 8: 1, 3, 5, 7.
7.
FLASHCARD QUESTION
Front
Какова формула для вычисления φ(n) для составного числа n?
Back
φ(n) = n * (1 - 1/p1) * (1 - 1/p2) * ... * (1 - 1/pk), где p1, p2, ..., pk — простые делители n.
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