# 加载中...

dbkaiser
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(2013-09-10 21:44)

## 起步

(2013-07-17 23:16)

# 特殊的排列数字

## 题目

The number, 1406357289, is a 0 to 9 pandigital number because it is made up of each of the digits 0 to 9 in some order, but it also has a rather interesting sub-string divisibility property.

Let d1 be the 1st digit, d2 be the 2nd digit, and so on. In this way, we note the following:

• d2d3d4=406 is divisible by 2
• d3d4d5=063 is divisible by 3
• d4d5d6=635 is divisible by 5
• d5d6d7

(2013-07-17 13:53)

# 欧拉小题42

## 题目

The nth term of the sequence of triangle numbers is given by, tn = ½n(n+1); so the first ten triangle numbers are:

1, 3, 6, 10, 15, 21, 28, 36, 45, 55, ...

By converting each letter in a word to a number corresponding to its alphabetical position and adding these values we form a word value. For example, the word value for SKY is 19 + 11 + 25 = 55 = t10. If the word value is a triangle number then we shall call the word a triangle word.

Using

(2013-07-15 23:48)

# 欧拉小题

## 题目简述

We shall say that an n-digit number is pandigital if it makes use of all the digits 1 to n exactly once. For example, 2143 is a 4-digit pandigital and is also prime.

What is the largest n-digit pandigital prime that exists?

## 解答

(2013-07-15 15:23)

# Mac 下 Meta键的使用

Windows、Linux下Alt键即为Meta键，mac键盘稍有不同，在使用emacs时会有点诡异。

(2013-07-15 15:15)

### metaweblogapi

XRPC API 写blog

=========================

（转自这里

(2013-07-14 15:56)

## 解锁与root

(2013-06-04 00:17)

## 今天尝试了一天的比特币下载。

* MHash/s，是每秒计算一百万hash的能力。
* MHash/J，电能每焦耳计算一百万hash的能力。

(2013-05-05 23:22)
 分类： 生活

(2013-03-10 16:46)