99987

Appears in sequences

• Largest n-digit squarefree number whose internal as well as external digits form a squarefree number, or 0 if no such number exists.at n=4A077380
• Number of steps in all Schroeder paths (i.e., consisting of steps U=(1,1), D=(1,-1),H=(2,0) and never going below the x-axis) from (0,0) to (2n,0).at n=6A089164
• Number of pairs of consecutive prime (p,q) with q-p=6 and q < 10^n.at n=6A093738
• Numbers that require exactly 8 iterations to determine that they are happy or not (A007770 and A031177).at n=27A193996
• Largest n-digit lucky number.at n=4A261512