170280

Appears in sequences

• a(n) = floor(n*(n-1)*(n-2)*(n-3)/21).at n=45A011931
• a(n) = floor( n*(n-1)*(n-2)*(n-3)/23 ).at n=46A011933
• a(n) = lcm(6n+2, 6n+4, 6n+6).at n=14A061506
• Smallest a(n) > a(n-1) such that a(n)^2+a(n-1)^2 is a perfect square, with a(1)=5.at n=39A076671
• Smallest a(n)>a(n-1) such that a(n)^2+a(n-1)^2 is a perfect square, a(1)=9.at n=39A076674
• Number of nX5 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 1 0 and 1 1 1 vertically.at n=12A209221