9991921

Appears in sequences

• Smallest square starting with a string of n 9's.at n=2A034995
• Squares composed of digits {1,2,9}.at n=4A053889
• a(n) = the largest n-digit number with exactly 9 divisors, a(n) = 0 if no such number exists.at n=6A182678
• Squares that remain squares if you decrease them by 7 times a repunit with the same number of digits.at n=7A273233