237237

Appears in sequences

• Lucky numbers that are concatenations of a number k with itself.at n=26A032650
• a(n) = n*(2*n-1)*(2*n+1).at n=39A035328
• a(0)=1, a(n) = (3n-1)*3n*(3n+1)/2 for n>0.at n=26A157024
• Smallest fixed points (>0) of the base-2*n Kaprekar map.at n=38A319839