89980

Appears in sequences

• Numbers n such that every digit of both n and n^2 contains a loop (only digits 0,4,6,8,9 in n and n^2).at n=25A107626
• Numbers k such that k and k^2 use only the digits 0, 4, 6, 8 and 9.at n=26A136956
• a(n) = 225*n^2 - n.at n=19A156813
• a(n) = 900*n^2 - 2*n.at n=9A158408
• a(n) = 400*n^2 - 20.at n=14A158597
• Row sums of the triangular array at A249057.at n=9A249059