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Largest product in a grid In the 20×20 grid below, four numbers along a diagonal line have been marked in red. 08 02 22 97 38 15 00 40 00 75 04 05 07 阅读全文
posted @ 2020-02-17 18:49
quanjun
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Summation of primes The sum of the primes below 10 is 2 + 3 + 5 + 7 = 17. Find the sum of all the primes below two million. 素数的和 所有小于10的素数的和是2 + 3 + 5 阅读全文
posted @ 2020-02-17 18:34
quanjun
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Special Pythagorean triplet A Pythagorean triplet is a set of three natural numbers, $a using namespace std; int main() { for (int i = 1; i <= 1000/3; 阅读全文
posted @ 2020-02-17 18:25
quanjun
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Largest product in a series The four adjacent digits in the 1000 digit number that have the greatest product are 9 × 9 × 8 × 9 = 5832. Find the thirte 阅读全文
posted @ 2020-02-17 18:14
quanjun
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10001st prime By listing the first six prime numbers: 2, 3, 5, 7, 11, and 13, we can see that the 6th prime is 13. What is the 10 001st prime number? 阅读全文
posted @ 2020-02-17 18:07
quanjun
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Sum square difference The sum of the squares of the first ten natural numbers is, $$1^2 + 2^2 + \cdots + 10^2 = 385$$ The square of the sum of the fir 阅读全文
posted @ 2020-02-17 17:57
quanjun
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Smallest multiple 2520 is the smallest number that can be divided by each of the numbers from 1 to 10 without any remainder. What is the smallest posi 阅读全文
posted @ 2020-02-17 17:47
quanjun
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Largest palindrome product A palindromic number reads the same both ways. The largest palindrome made from the product of two 2 digit numbers is 9009 阅读全文
posted @ 2020-02-17 17:23
quanjun
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Largest prime factor The prime factors of 13195 are 5, 7, 13 and 29. What is the largest prime factor of the number 600851475143 ? 最大质因数 13195的所有质因数为5 阅读全文
posted @ 2020-02-17 17:17
quanjun
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Even Fibonacci numbers Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2, the first 10 t 阅读全文
posted @ 2020-02-17 15:50
quanjun
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