18000000

Appears in sequences

• a(k) = k! * lim_{n->oo} card({ i*j; i=1..k, j=1..n })/n.at n=9A126959
• Base-10 complementary numbers: n equals the product of the 10's complement of its digits.at n=24A294090
• Numbers k such that sum of digits (k) and sum of digits (k^2) is 9.at n=24A325450
• Number of n-digit positive integers that are the product of two integers ending with 5.at n=8A337855