#include<bits/stdc++.h>
using namespace std;

//-std=c++11
//#define TRACE
#ifdef TRACE
#define trace(...) __f(#__VA_ARGS__, __VA_ARGS__)
template <typename Arg1>
void __f(const char* name, Arg1&& arg1){
	cerr << name << " : " << arg1 << std::endl;
}
template <typename Arg1, typename... Args>
void __f(const char* names, Arg1&& arg1, Args&&... args){
	const char* comma = strchr(names + 1, ',');cerr.write(names, comma - names) << " : " << arg1<<" | ";__f(comma+1, args...);
}
#else
#define trace(...)
#endif

#define LL long long
#define FI ios_base::sync_with_stdio(false); cin.tie(NULL);
#define PREC cout << setprecision(10) << fixed;

#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;

template <class T> struct cmp {
	bool operator() (T x, T y) {
		return x.first < y.first;
	}
};
template <class T> using ordered_set = tree<T, null_type, cmp<T>, rb_tree_tag, tree_order_statistics_node_update>;

#define int long long

const int MOD = 1e9 + 7;
const int INF = 1e9 + 9;
const int MX = 1e5 + 5;

bool isPrime[MX];
void sieve() {
	memset(isPrime, true, sizeof isPrime);
	isPrime[0] = isPrime[1] = false;
	for(int i=2;i*i<MX;i++) {
		if(isPrime[i] == false) continue;
		for(int j=i*i;j<MX;j+=i) {
			isPrime[j] = false;		
		}
	} 
}

int n, k;
int inp[MX];

#undef int 
int main() {
	#define int long long
	FI;
	sieve();
	int tt;
	cin >> tt;
	while(tt--) {
		cin >> n >> k;
		for(int i=0;i<n;i++) {
			cin >> inp[i];
		}

		ordered_set<pair<int,int> > st;
		int ans = 0;

		int sum = 0;
		for(int i=0;i<k;i++) {
			st.insert({inp[i],i});
			sum += inp[i];
		}
		int avg = sum/k;
		auto it = st.find_by_order((k-1) /2);
		assert(it != st.end());
		int med = it->first;

		assert(avg >= 0 && med >= 0);
		if(isPrime[avg] == isPrime[med] && avg >= med) ans++;

		for(int i=k;i<n;i++) {
			sum += inp[i] - inp[i-k];
			st.erase({inp[i-k], i-k});
			st.insert({inp[i], i});

			avg = sum/k;
			it = st.find_by_order((k-1) /2);
			assert(it != st.end());
			med = it->first;

			assert(avg >= 0 && med >= 0);
			if(isPrime[avg] == isPrime[med] && avg >= med) ans++;
		}
		cout << ans << endl;
	}
	
	return 0;
}