51181

Appears in sequences

• Numbers having four 7's in base 9.at n=15A043484
• Smallest composite x such that sigma(x+2^n) = sigma(x) + 2^n.at n=15A054987
• Number of (w,x,y,z) with all terms in {1,...,n} and w^2>=x*y*z.at n=25A212064
• The Wiener index of the graph obtained by applying Mycielski's construction to a benzenoid consisting of a linear chain of n hexagons.at n=22A228597
• Sum of divisors of the minimal numbers (A007416).at n=40A256259
• Number of nX3 0..1 arrays with every element unequal to 0, 1, 2 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=12A318070