68377

Appears in sequences

• Number of squares (of positive integers) with n digits.at n=9A049415
• Number of squares (including 0) with n digits.at n=9A062940
• Numbers n such that sigma_3(n) is divisible by square of cototient of n, while n is not a prime number.at n=26A091286
• a(n) = the largest number one can subtract from 10^n such that the square of the result is strictly greater than 10^(2*n-1).at n=4A128869
• Composite numbers k for which k - phi(k) divides k-1.at n=19A160599