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・ Weird fiction
・ Weird Fish
・ Weird fish
・ Weird Food and Devastation
・ Weird Heroes
・ Weird Kids (album)
・ Weird Lake
・ Weird Little Boy
・ Weird Loners
・ Weird machine
・ Weird MC
・ Weird menace
・ Weird Mystery Tales
・ Weird Nature
・ Weird NJ
Weird number
・ Weird or What?
・ Weird Paul Petroskey
・ Weird Revolution
・ Weird Scenes Inside the Gold Mine
・ Weird Science
・ Weird Science (comics)
・ Weird Science (film)
・ Weird Science (song)
・ Weird Science (TV series)
・ Weird Science-Fantasy
・ Weird Shadows Over Innsmouth
・ Weird Shapes
・ Weird Sisters (disambiguation)
・ Weird Tales


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Weird number : ウィキペディア英語版
Weird number

In number theory, a weird number is a natural number that is abundant but not semiperfect.〔
〕〔 Section B2.〕
In other words, the sum of the proper divisors (divisors including 1 but not itself) of the number is greater than the number, but no subset of those divisors sums to the number itself.
== Examples ==

The smallest weird number is 70. Its proper divisors are 1, 2, 5, 7, 10, 14, and 35; these sum to 74, but no subset of these sums to 70. The number 12, for example, is abundant but ''not'' weird, because the proper divisors of 12 are 1, 2, 3, 4, and 6, which sum to 16; but 2+4+6 = 12.
The first few weird numbers are
: 70, 836, 4030, 5830, 7192, 7912, 9272, 10430, 10570, 10792, 10990, 11410, 11690, 12110, 12530, 12670, 13370, 13510, 13790, 13930, 14770, ... .

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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