import sys
input = sys.stdin.readline

N = int(input())
A = list(map(int, input().split()))
M = int(N**0.5)
dp = [0]*N
dp[0] = 1
acc = [[0]*M for _ in range(M)]
MOD = 10**9+7

for i in range(N):
    if i>0 and A[i-1]>1:
        dp[i] += dp[i-1]
        dp[i] %= MOD
        
    for j in range(1, M):
        dp[i] += acc[j][(i+1)%j]
        dp[i] %= MOD
    
    if A[i]>=M:
        for j in range(i+A[i], N, A[i]):
            dp[j] += dp[i]
            dp[j] %= MOD
    else:
        acc[A[i]][(i+1)%A[i]] += dp[i]
        acc[A[i]][(i+1)%A[i]] %= MOD

print(dp[N-1])