196020

Appears in sequences

• Numbers m such that m^2 + (reversal of m)^2 is a square. (Leading 0's are ignored.)at n=3A068536
• A sequence derived from pentagonal numbers, or a Stirling number of the first kind matrix.at n=39A094952
• Number of (w,x,y,z) with all terms in {1,...,n} and w<=2x and y>3z.at n=36A212514
• The Wiener index of the linear phenylene with n hexagons.at n=21A224454
• a(n) is the conjectured largest number such that both a(n) and a(n) - n are 11-smooth numbers, or 0 if no such number exists. a(n) can be less than n.at n=19A392256