Ifpis the perimeter of a right angle triangle with integral length sides, {a,b,c}, there are exactly three solutions forp= 120.{20,48,52}, {24,45,51},...
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其他好文 时间：
2015-10-06 10:17:33
阅读次数：
173
Coin partitions Let p(n) represent the number of different ways in which n coins can be separated into piles. For example, five coins can separated in...
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其他好文 时间：
2015-10-02 22:31:20
阅读次数：
260
原题：Prime summationsIt is possible to write ten as the sum of primes in exactly five different ways:7 + 35 + 55 + 3 + 23 + 3 + 2 + 22 + 2 + 2 + 2 + 2Wh...
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其他好文 时间：
2015-10-02 17:15:17
阅读次数：
212
题目链接 原题： It is possible to write five as a sum in exactly six different ways: 4 + 13 + 23 + 1 + 12 + 2 + 12 + 1 + 1 + 11 + 1 + 1 + 1 + 1 How many diff...
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其他好文 时间：
2015-10-02 10:07:32
阅读次数：
189
Starting with the number 1 and moving to the right in a clockwise direction a 5 by 5 spiral is formed as follows:2122 23 242520 78 91019 6 12 1118 54 ...
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其他好文 时间：
2015-09-23 14:50:07
阅读次数：
130
题目
昨天，类型安全的心园友发表了一篇随笔“[Project
Euler]加入欧拉 Problem 13 被卡住了，调试不出正确结果囧”。这道题目是要求计算出下面的100个50位数字的和的前十位数字：
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
...
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其他好文 时间：
2015-08-03 14:45:27
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112
By using each of the digits from the set, {1, 2, 3, 4}, exactly once, and making use of the four arithmetic operations (+, ?, *, /) and brackets/parentheses, it is possible to form
different positiv...
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其他好文 时间：
2015-07-26 19:21:34
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378
A number chain is created by continuously adding the square of the digits in a number to form a new number until it has been seen before.
For example,
44 → 32 → 13 → 10 → 1 → 1
85 → 89 → 145 → 42...
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其他好文 时间：
2015-07-26 15:52:18
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152
The points P (x1, y1) and Q (x2, y2) are plotted at integer co-ordinates and are joined to the origin,
O(0,0), to form ΔOPQ.
There are exactly fourteen triangles containing a right angle that...
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其他好文 时间：
2015-07-26 00:35:30
阅读次数：
384
Each of the six faces on a cube has a different digit (0 to 9) written on it; the same is done to a second cube. By placing the two cubes side-by-side in different positions we can
form a variety of...
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其他好文 时间：
2015-07-24 22:42:52
阅读次数：
231
