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73 has 37 as the mirroring of its decimal digits. 73 is the 21st prime number, and 37 the 12th. The "mirror property" is fulfilled when 73 has a mirrored permutation of its digits (37) that remains prime.
Perfect numbers are natural numbers that equal the sum of their positive proper divisors, which are divisors excluding the number itself. So, 6 is a perfect number because the proper divisors of 6 are 1, 2, and 3, and 1 + 2 + 3 = 6. [2] [4]
In mathematics, a multiply perfect number (also called multiperfect number or pluperfect number) is a generalization of a perfect number. ... 73 (4): 307 – 310. doi ...
In number theory, a perfect number is a positive integer that is equal to the sum of its positive proper divisors, that is, divisors excluding the number itself. [1] For instance, 6 has proper divisors 1, 2 and 3, and 1 + 2 + 3 = 6, so 6 is a perfect number. The next perfect number is 28, since 1 + 2 + 4 + 7 + 14 = 28.
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a perfect number equals the sum of its proper divisors; ... 73: 1, 73 2 74 1 deficient, prime 74: 1, 2, 37, 74 4 114 40 deficient, composite 75: 1, 3, 5, 15, 25, 75 6
And it’s not just in the U.S., research from Trainline shows that the number of employees spending more than three hours from work and back has doubled since before the pandemic in the U.K.
On Monday, a team at IBM that is contracted to manage human resources data for more than 500,000 federal employees received an unusual request to provide “read-only” access for the HR records ...