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Date: 5-6-2020
790
Date: 19-3-2020
513
Date: 29-10-2019
1002
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Let
where is the divisor function and is the restricted divisor function, and define the aliquot sequence of by
If the sequence reaches a constant, the constant is known as a perfect number. A number that is not perfect but whose sequence becomes constant is known as an aspiring number. For example, beginning with 25 gives the sequence 25, 6, 6, 6, ..., so 25 is an aspiring number and 6 is a perfect number.
The first few aspiring numbers are 25, 95, 119, 143, ... (OEIS A063769). It is not known if 276 is an aspiring number, though it is very unlikely for this to be the case.
REFERENCES:
Sloane, N. J. A. Sequence A063769 in "The On-Line Encyclopedia of Integer Sequences."
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5 علامات تحذيرية قد تدل على "مشكل خطير" في الكبد
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تستخدم لأول مرة... مستشفى الإمام زين العابدين (ع) التابع للعتبة الحسينية يعتمد تقنيات حديثة في تثبيت الكسور المعقدة
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