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PE_7.kt
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PE_7.kt
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package kotlin_practice
/**
* @author bertking
* @date 2019/4/19
*/
class PE_7 {
fun isPrime(value: Long): Boolean {
for (i in 2..Math.sqrt(value.toDouble()).toLong()) {
if (value % i == 0L) {
return false
}
}
return true
}
fun primeInRange(length: Int) {
var list = arrayListOf<Int>()
var range = 100
var start = 2
while (list.size < length){
for (i in start..range) {
if (isPrime(i.toLong())) {
println("prime number:$i")
if (list.size < length) {
list.add(i)
} else {
break
}
}
}
start = range
range *= 10
println("range == $range")
}
println(list.last())
}
}
fun main(args: Array<String>) {
val pe_7 = PE_7()
pe_7.primeInRange(10001)
}