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A perfect number is equal to the sum of its proper positive divisors.
A mirror perfect number is equal to the sum of its proper positive divisors when they are read backwards.
From a paper by Joseph L. Pe which is available on the 'net:
10311 = 1 + 3 + 7 + 21 + 491 + 1473 + 3437
7343 + 3741 + 194 + 12 + 7 + 3 + 1 = 11301
10311 is perfect and mirror perfect.
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∙ 10y ago
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convex mirror is used to reject coming rays and to see perfect.
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yes but don't spit
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Ask your mom.
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Can a perfect number be odd?
If by 'perfect number' you mean 'perfect SQUARE', then yes. 49 is an odd number and a perfect square.
What is the third perfect number?
496 is the third perfect number and 8128 is the fourth perfect number.
What number is both a square number and a cube number between 1 and 25?
There is not a number that is a perfect square and perfect cube between 1 and 25.There is not a number that is a perfect square and perfect cube between 1 and 25.There is not a number that is a perfect square and perfect cube between 1 and 25.There is not a number that is a perfect square and perfect cube between 1 and 25.
Is 28 a perfect number?
Yes it is. 6 is the first perfect number, 28 is the second perfect number.
