例句與造句

1. An integer n > 1 whose only proper divisor is 1 is called a prime number.
2. A semiperfect number that is equal to the sum of all its proper divisors is a perfect number.
3. Its proper divisors are 1, 2, 3, 4 and 6 for a total of 16.
4. A semiperfect number is a natural number that is equal to the sum of all or some of its proper divisors.
5. However, there is no integer which has 120 as the sum of its proper divisors, making 120 an untouchable number.
6. It's difficult to find proper divisors in a sentence. 用proper divisors造句挺難的
7. No perfect number is untouchable, since, at the very least, it can be expressed as the sum of its own proper divisors.
8. For example, the number 4 is not untouchable as it is equal to the sum of the proper divisors of 9 : 1 + 3 = 4.
9. Since six equals the sum of its proper divisors, six is the smallest perfect number, Granville number, and \ mathcal { S }-perfect number.
10. Since there is a subset of 12's proper divisors that add up to 12 ( all of them but with 4 excluded ), 12 is a semiperfect number.
11. Sociable numbers are the numbers in cyclic lists of numbers ( with a length greater than 2 ) where each number is the sum of the proper divisors of the preceding number.
12. Its proper divisors are 1, 2, 5, 7, 10, 14, and 35; these sum to 74, but no subset of these sums to 70.
13. A closely related problem concerns sets of integers in which each integer in the set is a divisor, but not necessarily a proper divisor, of one plus the product of the other integers in the set.
14. In number theory, an "'abundant number "'or "'excessive number "'is a number for which the sum of its proper divisors is greater than the number itself.
15. A related concept is that of a perfect number, which is a number that equals the sum of " its own " proper divisors, in other words a number which forms an aliquot sequence of period 1.
16. If the period of the sequence is 1, the number is a sociable number of order 1, or a perfect number for example, the proper divisors of 6 are 1, 2, and 3, whose sum is again 6.
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