【题目】A three-digit number is the product offour prime numbers.Given that the three-digitof the number are all prime and different and that the sum of its prime factors is 30 ,find the number. 相关知识点: 试题来源: 解析 【解析】A three-digit好像是“三位数”的意思一个三位数是四个...
Answer to: The units digit of a three-digit number is prime. The hundreds digit is twice the tens digit. How many of these three-digit numbers are...
八、未来数学家(15%)1.We write down a two-digit prime number on the right side of another different two-digit prime number,so we get a four-digit number.This number can be divided exactlyby half of the sum of these two prime numbers.So what's the maximum product of thetwo prime numb...
For example, in the number 7331, the first digit number 7 is a prime number; the number till the second digit 73 is a prime number; the number till the third digit 733 is too a prime number; the number till the last digit 7331 is also a prime number. When a digit of a serial d...
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1The natural number N is a two-digit prime number, and the ones-digit and tens-digit of Nare both prime numbers. How many such natural numbers are there? 2【题目】T he natural number Nis a two-digit prime number,and the ones-digit and tens-digit of Nare both primenumbers. How many...
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is a two-digit prime number no more than 50,and 2p+1 is also a prime number. If the sum of p is x, find the value of x. 相关知识点: 试题来源: 解析 104 The possibility of p is as followed: p 11 13 17 19 23 29 31 37 41 43 47 2p+1 23 27 35 39 47 59 63 75 83 8...
(Note that if the second digit were also 0, it would not be a three-digit number.) FromOctober's Menu of Problems, October 2006 16、Squares on a Board How many squares are on a traditional 8 × 8 checkerboard? (By the way, the answer is not 64.) Solution 204 squares. You have ...
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