题目一: 10以下的自然数中,属于3和5的倍数的有3,5,6和9,它们之和是23. 找出1000以下的自然数中,属于3和5的倍数的数字之和。 本题总结: 判断语句要善于用逻辑运算符。 题目二: 斐波那契数列中的每一项被定义为前两项之和。从1和2开始,斐波那契数列的前十项为: 1, 2, 3, 5, ...
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其他好文 时间:
2016-09-22 12:56:56
阅读次数:
158
Project Euler: 欧拉计划是一系列挑战数学或者计算机编程问题,解决这些问题需要的不仅仅是数学功底。 启动这一项目的目的在于,为乐于探索的人提供一个钻研其他领域并且学习新知识的平台,将这一平台打造一个有趣和休闲 的环境。 项目主页:https://projecteuler.net 第一题 ...
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其他好文 时间:
2015-10-31 18:26:20
阅读次数:
167
Champernowne’s constant
Problem 40
An irrational decimal fraction is created by concatenating the positive integers:0.123456789101112131415161718192021…It can be seen that the 12th digit of the fract...
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其他好文 时间:
2015-07-18 02:06:56
阅读次数:
158
Digit factorials
Problem 34
145 is a curious number, as 1! + 4! + 5! = 1 + 24 + 120 = 145.Find the sum of all numbers which are equal to the sum of the factorial of their digits.Note: as 1! = 1 and 2...
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其他好文 时间:
2015-07-09 00:50:46
阅读次数:
166
1000-digit Fibonacci number
Problem 25
The Fibonacci sequence is defined by the recurrence relation:
Fn = Fn?1 + Fn?2, where F1 = 1 and F2 = 1.
Hence the first 12 terms will be:
F1 = 1
F...
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编程语言 时间:
2015-06-18 09:52:36
阅读次数:
175
Reciprocal cycles
Problem 26
A unit fraction contains 1 in the numerator. The decimal representation of the unit fractions with denominators 2 to 10 are given:
1/2
=
0.5
1/3...
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编程语言 时间:
2015-06-17 21:45:33
阅读次数:
147
Quadratic primes
Problem 27
Euler discovered the remarkable quadratic formula:
n² + n + 41
It turns out that the formula will produce 40 primes for the consecutive values n = 0 to 39. Howe...
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编程语言 时间:
2015-06-17 21:37:46
阅读次数:
149
Distinct powers
Problem 29
Consider all integer combinations of ab for 2 ≤ a ≤ 5 and 2 ≤ b ≤ 5:
22=4, 23=8, 24=16, 25=32
32=9, 33=27, 34=81, 35=243
42=16, 43=64, 44=256, 45=1024
52=25, 5...
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编程语言 时间:
2015-06-17 21:36:18
阅读次数:
220
Names scores
Problem 22
Using names.txt (right click and 'Save Link/Target As...'), a 46K text file containing over five-thousand first names,
begin by sorting it into alphabetical order. ...
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编程语言 时间:
2015-06-17 21:33:53
阅读次数:
223
Counting Sundays
Problem 19
You are given the following information, but you may prefer to do some research for yourself.
1 Jan 1900 was a Monday.Thirty days has September,
April, June a...
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编程语言 时间:
2015-04-16 10:27:29
阅读次数:
170