ProjectEuler 501 Eight Divisors - 拼圖

By Zanna
at 2015-02-01T15:49
at 2015-02-01T15:49
Table of Contents
501. Eight Divisors
http://projecteuler.net/problem=501
24的8個約數為1, 2, 3, 4, 6, 8, 12 和 24
不超過100而恰好有8個約數的10個數字為24, 30, 40, 42, 54, 56, 66, 70, 78 和 88
令f(n)為不超過n而恰好有8個約數的數字個數
f(100) = 10, f(1000) = 180 及 f(10^6) = 224427
求f(10^12)
--
http://projecteuler.net/problem=501
24的8個約數為1, 2, 3, 4, 6, 8, 12 和 24
不超過100而恰好有8個約數的10個數字為24, 30, 40, 42, 54, 56, 66, 70, 78 和 88
令f(n)為不超過n而恰好有8個約數的數字個數
f(100) = 10, f(1000) = 180 及 f(10^6) = 224427
求f(10^12)
--
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