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Why do we check up to the square root of a prime number to determine if it is prime?

... n = 12 m = sqrt(12) = 3.46, a = 2, b = 6. n = mm i.e. 12=3.46*3.46 and n = ab i.e 12=2*6. Now condition 3. a < m < b i.e 2 < 3.46 < 6. So to check prime we only need to check for number less than 3.46 which is 2 to fi...
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Create a hexadecimal colour based on a string with JavaScript

...d be! – Florian Bauer May 28 '16 at 12:22 @haykam Thanks for making it into a snippet! – Thymine...
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Citing the author of a blockquote using Markdown syntax

...which I personally think looks great! https://gist.github.com/nahtnam/63e3a14acd0f02313ec0 share | improve this answer | follow | ...
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Convert varchar to uniqueidentifier in SQL Server

... 127 DECLARE @uuid VARCHAR(50) SET @uuid = 'a89b1acd95016ae6b9c8aabb07da2010' SELECT CAST( ...
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Best way to serialize an NSData into a hexadeximal string

... answered Jan 31 '12 at 18:18 DaveDave 11.6k1111 gold badges5858 silver badges6767 bronze badges ...
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How can I create a Set of Sets in Python?

... 121 Python's complaining because the inner set objects are mutable and thus not hashable. The solu...
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Update value of a nested dictionary of varying depth

... Alex MartelliAlex Martelli 724k148148 gold badges11261126 silver badges13241324 bronze badges ...
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PHP: How to generate a random, unique, alphanumeric string for use in a secret link?

...on $transationID = generate_uuid(); some example outputs will be like: E302D66D-87E3-4450-8CB6-17531895BF14 22D288BC-7289-442B-BEEA-286777D559F2 51B4DE29-3B71-4FD2-9E6C-071703E1FF31 3777C8C6-9FF5-4C78-AAA2-08A47F555E81 54B91C72-2CF4-4501-A6E9-02A60DCBAE4C 60F75C7C-1AE3-417B-82C8-14D456542CD7 8DE...
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How many bytes does one Unicode character take?

...8: E2 9C 9E UTF-16: 27 1E U+3020 POSTAL MARK FACE: 〠 Nº: 12320 UTF-8: E3 80 A0 UTF-16: 30 20 U+8089 CJK UNIFIED IDEOGRAPH-8089: 肉 Nº: 32905 UTF-8: E8 82 89 UTF-16: 80 89 U+1F4A9 PILE OF POO: ???? Nº: 128169 UTF-8: F0 9F 92 A9 UTF-16: D8 3D DC A9 U+1F680 ROCKET: ???? Nº: 128640 UTF-...
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30岁之后,程序员该向什么方向发展? - 杂谈 - 清泛网 - 专注C/C++及内核技术

...长时间才能接回来,所以一般晚上工作比较有效率。 Q & A3、请问teambition招研发最看重的是哪点? 严清: 最看重学习能力和技术热情度,说白了就是看你能不能成为一个技术牛人。通过你的作品和日常生活来看。 Q & A4、作为...