#include <bits/stdc++.h>
using namespace std;
#define rep(i,s,e) for(i64 (i) = (s);(i) < (e);(i)++)
#define rev(i,s,e) for(i64 (i) = (s);(i) --> (e);)
#define all(x) x.begin(),x.end()

template<class T>
static inline std::vector<T> ndvec(size_t&& n, T val) noexcept {
  return std::vector<T>(n, std::forward<T>(val));
}

template<class... Tail>
static inline auto ndvec(size_t&& n, Tail&&... tail) noexcept {
  return std::vector<decltype(ndvec(std::forward<Tail>(tail)...))>(n, ndvec(std::forward<Tail>(tail)...));
}

#pragma GCC target("avx")


#include <bits/stdc++.h>
using namespace std;
using i64 = long long;

template<i64 M>
struct modint {
  i64 a;
  constexpr modint(const i64 x = 0) noexcept: a(x) {}
  constexpr i64 value() const noexcept { return a; }
  constexpr modint pow(i64 r) const noexcept {
    modint ans(1);
    modint aa = *this;
    while(r) {
      if(r & 1) {
        ans *= aa;
      } aa *= aa;
      r >>= 1;
    }
    return ans;
  }
  constexpr modint& operator+=(const modint r) noexcept {
    a += r.a;
    if(a >= M) a -= M;
    return *this;
  }
  constexpr modint& operator=(const i64 r) {
    a = (r % M + M) % M;
    return *this;
  }
  constexpr modint& operator-=(const modint r) noexcept {
    a -= r.a;
    if(a < 0) a += M;
    return *this;
  }
  constexpr modint& operator*=(const modint r) noexcept {
    a = a * r.a % M;
    return *this;
  }
  constexpr modint& operator/=(modint r) noexcept {
    i64 ex = M - 2;
    while(ex) {
      if(ex & 1) {
        *this *= r;
      }
      r *= r;
      ex >>= 1;
    }
    return *this;
  }

  constexpr modint operator+(const modint r) const {
    return modint(*this) += r;
  }
  constexpr modint operator-(const modint r) const {
    return modint(*this) -= r;
  }
  constexpr modint operator*(const modint r) const {
    return modint(*this) *= r;
  }
  constexpr modint operator/(const modint r) const {
    return modint(*this) /= r;
  }
};

template<const i64 M>
std::ostream& operator<<(std::ostream& os, const modint<M>& m) {
  os << m.value();
  return os;
}

const i64 MOD = 998244353;
using fp = modint<MOD>;


i64 gcd(i64 a, i64 b) {
  while(b != 0) {
    a %= b;
    swap(a, b);
  }
  return a;
}

#include <cstdio>

namespace niu {
  char cur;
  struct FIN {
    static inline bool is_blank(char c) { return c <= ' '; }
    inline char next() { return cur = getc_unlocked(stdin); }
    inline char peek() { return cur; }
    inline void skip() { while(is_blank(next())){} }
#define intin(inttype)  \
    FIN& operator>>(inttype& n) { \
      bool sign = 0; \
      n = 0; \
      skip(); \
      while(!is_blank(peek())) { \
        if(peek() == '-') sign = 1; \
        else n = (n << 1) + (n << 3) + (peek() & 0b1111); \
        next(); \
      } \
      if(sign) n = -n; \
      return *this; \
    }
intin(int)
intin(long long)
  } fin;

  char tmp[128];
  struct FOUT {
    static inline bool is_blank(char c) { return c <= ' '; }
    inline void push(char c) { putc_unlocked(c, stdout); }
    FOUT& operator<<(char c) { push(c); return *this; }
    FOUT& operator<<(const char* s) { while(*s) push(*s++); return *this; }
#define intout(inttype) \
    FOUT& operator<<(inttype n) { \
      if(n) { \
        char* p = tmp + 127; bool neg = 0; \
        if(n < 0) neg = 1, n = -n; \
        while(n) *--p = (n % 10) | 0b00110000, n /= 10; \
        if(neg) *--p = '-'; \
        return (*this) << p; \
      } \
      else { \
        push('0'); \
        return *this; \
      } \
    }
intout(int)
intout(long long)
  } fout;
}

constexpr i64 A = 1e6 + 1;
int divs[A][240];
int dcnt[A];


int main() {
  rep(i,1,A) {
    for(i64 x = i; x < A; x += i) {
      divs[x][dcnt[x]] = i;
      dcnt[x]++;
    }
  }

  std::vector<int> mu(A);
  mu[1] = 1;
  rep(x,2,A) {
    for(int i = 0;i < dcnt[x];i++) {
      int d = divs[x][i];
      if(d < x) mu[x] -= mu[d];
    }
  }
  std::vector<fp> g(A);
  rep(i,1,A) {
    g[i] = fp(i).pow(MOD - 2);
  }

  std::vector<fp> f(A);
  rep(x,1,A) {
    for(int i = 0;i < dcnt[x];i++) {
      int d = divs[x][i];
      if(mu[d] == 1) f[x] += g[x / d];
      if(mu[d] == -1) f[x] -= g[x / d];
    }
  }

  i64 N;
  niu::fin >> N;
  vector<fp> sum(A);
  fp ans = 0;
  rep(i,0,N) {
    int x;
    niu::fin >> x;
    fp res = 0;
    for(int j = 0;j < dcnt[x];j++) {
      int d = divs[x][j];
      res += f[d] * sum[d];
      sum[d] += fp(x);
    }
    ans += res * fp(x);
  }
  niu::fout << ans.value() << "\n";
}


Measured memory_bytes: 969088