#include <bits/stdc++.h>
#define whlie while
#define pb push_back
#define eb emplace_back
#define fi first
#define se second
#define rep(i,N) for(int i = 0; i < (N); i++)
#define repr(i,N) for(int i = (N) - 1; i >= 0; i--)
#define rep1(i,N) for(int i = 1; i <= (N) ; i++)
#define repr1(i,N) for(int i = (N) ; i > 0 ; i--)
#define each(x,v) for(auto& x : v)
#define all(v) (v).begin(),(v).end()
#define sz(v) ((int)(v).size())
#define vrep(v,it) for(auto it = v.begin(); it != v.end(); it++)
#define vrepr(v,it) for(auto it = v.rbegin(); it != v.rend(); it++)
#define ini(...) int __VA_ARGS__; in(__VA_ARGS__)
#define inl(...) ll __VA_ARGS__; in(__VA_ARGS__)
#define ins(...) string __VA_ARGS__; in(__VA_ARGS__)
using namespace std; void solve();
using ll = long long; using vl = vector<ll>;
using vi = vector<int>; using vvi = vector< vector<int> >;
constexpr int inf = 1001001001;
constexpr ll infLL = (1LL << 61) - 1;
struct IoSetupNya {IoSetupNya() { cin.tie(nullptr); ios::sync_with_stdio(false); cout << fixed << setprecision(15); cerr << fixed << setprecision(7);} } iosetupnya;
template<typename T, typename U> inline bool amin(T &x, U y) { return (y < x) ? (x = y, true) : false; }
template<typename T, typename U> inline bool amax(T &x, U y) { return (x < y) ? (x = y, true) : false; }
template<typename T, typename U> ostream& operator <<(ostream& os, const pair<T, U> &p) { os << p.first << " " << p.second; return os; }
template<typename T, typename U> istream& operator >>(istream& is, pair<T, U> &p) { is >> p.first >> p.second; return is; }
template<typename T> ostream& operator <<(ostream& os, const vector<T> &v) { int s = (int)v.size(); rep(i,s) os << (i ? " " : "") << v[i]; return os; }
template<typename T> istream& operator >>(istream& is, vector<T> &v) { for(auto &x : v) is >> x; return is; }
void in(){} template <typename T,class... U> void in(T &t,U &...u){ cin >> t; in(u...);}
void out(){cout << "\n";} template <typename T,class... U> void out(const T &t,const U &...u){ cout << t; if(sizeof...(u)) cout << " "; out(u...);}
template<typename T>void die(T x){out(x); exit(0);}
#ifdef NyaanDebug
  #include "NyaanDebug.h"
  #define trc(...) do { cerr << #__VA_ARGS__ << " = "; dbg_out(__VA_ARGS__);} while(0)
  #define trca(v,...) do { cerr << #v << " = "; array_out(v , __VA_ARGS__ );} while(0)
#else
  #define trc(...)
  #define trca(...)
  int main(){solve();}
#endif
 
using P = pair<ll,ll>; using vp = vector<P>;
constexpr int MOD = /** 1000000007; //*/ 998244353;
/////////////////

struct multiple_transform{

  vector<int> prime;
  multiple_transform(int N) {
    vector<int> sieve(N + 1 , 1);
    sieve[0] = sieve[1] = 0;
    for(int p = 2; p <= N; p++){
      if(sieve[p]){
        prime.push_back(p);
        for(int j = p << 1; j <= N; j += p) sieve[j] = 0;
      }
    }
  }
  
  template <typename T>void zeta_transform(vector<T> &a){
    int N = a.size() - 1;
    for(auto &p : prime)
      for(int k = N / p; k > 0; k--){
        a[k] += a[k * p];
        if(a[k] >= MOD) a[k] -= MOD;
      }
  }
  
  template <typename T>void mobius_transform(vector<T> &a){
    int N = a.size() - 1;
    for(auto it=prime.rbegin(); it!=prime.rend(); it++)
      for(int k = 1; k * (*it) <= N; k++){
        a[k] -= a[k * (*it)];
        if(a[k] < 0) a[k] += MOD;
      }
  }

};

template<int N> struct invinit{
  long long inv[N + 1];
  invinit() : inv()  {
    inv[0] = 0; inv[1] = 1;
    for(int i = 2; i <= N ; i++){
      inv[i] = MOD - inv[MOD % i] * (MOD / i) % MOD;
    }
  }
  const long long& operator[](long long i) const{return inv[i];}
};

void solve(){
  constexpr int M = 1000000;
  multiple_transform mul(M);
  auto inv = invinit<M>();
  ini(N); vi v(N); in(v);
  vector<ll> a(M + 1 , 0);
  each(x , v){
    a[x] += x;
    if(a[x] >= MOD) a[x] -= MOD;
  }

  mul.zeta_transform(a);
  each(x , a) if(x != 0) { x = x * x; if(x>MOD) x = x % MOD;}

  mul.mobius_transform(a);

  ll ans = 0;
  rep1(i,M) if(a[i] != 0) ans += a[i] * inv[i] % MOD;
  each(x , v) ans -= x;
  ans = ans % MOD;
  if(ans < 0) ans += MOD;
  if(ans & 1) ans = (ans + MOD) / 2; else ans = ans / 2;
  out(ans);
}


Measured memory_bytes: 16948