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Sublime number : ウィキペディア英語版
Sublime number
In number theory, a sublime number is a positive integer which has a perfect number of positive divisors (including itself), and whose positive divisors add up to another perfect number.〔MathPages article, ("Sublime Numbers" ).〕
The number 12, for example, is a sublime number. It has a perfect number of positive divisors (6): 1, 2, 3, 4, 6, and 12, and the sum of these is again a perfect number: 1 + 2 + 3 + 4 + 6 + 12 = 28.
There are only two known sublime numbers, 12 and (2126)(261 − 1)(231 − 1)(219 − 1)(27 − 1)(25 − 1)(23 − 1) .〔Clifford A. Pickover, ''Wonders of Numbers, Adventures in Mathematics, Mind and Meaning'' New York: Oxford University Press (2003): 215〕 The second of these has 76 decimal digits:
:6086555670238378989670371734243169622657830773351885970528324860512791691264.
== References ==



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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