No.1657 Sum is Prime (Easy Version)
問題文最終更新日: 2022-04-26 00:04:10
English (AI translation)
Sum is Prime (Easy Version)
This statement was translated by AI (claude-opus-5-5, effort medium) and may contain errors or differ in nuance from the original. The original statement takes precedence. Show the original
This statement was translated by AI (claude-opus-5-5, effort medium) and may contain errors or differ in nuance from the original. The original statement takes precedence. Show the original
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The only differences from the Hard Version are the constraints and the time limit.
Problem Statement
You are given positive integers $L,R$ satisfying $L\le R$. Find the number of pairs of integers $(A,B)$ that satisfy the following $2$ conditions.
- $L\le A\le B\le R$
- $A+(A+1)+\cdots+B$ is prime
Constraints
- $1\le L\le R\le 10^6$
- All input values are integers
Input
$L$ $R$
Output
Output the number of pairs $(A,B)$.
Sample
Sample 1
Input
1 4
Output
5
There are $5$ such pairs: $(A,B)=(1,2),(2,2),(2,3),(3,3),(3,4)$.
Sample 2
Input
7 7
Output
1
Sample 3
Input
132422 969076
Output
185373
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