4472135955

Appears in sequences

• a(n) is root of square starting with digit 2: first term of runs.at n=18A035069
• a(n)^2 is the smallest positive square that contains n consecutive internal 0's.at n=12A066392
• Index of smallest triangular number with n digits.at n=19A068092
• a(n) = the smallest positive number, not ending in 0, whose square has a substring of exactly n identical digits.at n=11A167712
• Number of triangular numbers <= 10^n.at n=19A236043