357875

Appears in sequences

• a(0)=1 and for n>0: a(n) = if gcd(a(n-1),n)>1 then lcm(a(n-1),n) else a(n-1)+n.at n=18A076607
• Number of tilings of a 4 X n rectangle using integer-sided rectangular tiles of area 4.at n=19A220123