28380

Appears in sequences

• a(n) = 2*binomial(n,3).at n=45A007290
• Numbers k such that 217*2^k+1 is prime.at n=8A032485
• Lower triangular matrix T = Pascal lower triangular matrix divided on the left by its entry-square.at n=23A039910
• Fifth column (m=4) of triangle A060098.at n=13A060100
• Fifth column (m=4) of triangle A060556.at n=6A060558
• Number of (w,x,y) with all terms in {0,...,n} and |w-x| != |x-y|.at n=30A212960
• Size of the smallest conjugacy class of size greater than 1 of the alternating group of degree n.at n=41A237036
• Sum of x*y^2*z^3 for positive integers x,y,z with x + y + z = n.at n=9A241205
• a(n) = 2*A000447(n).at n=22A259110
• Numbers whose distance to the nearest cube equals the distance to the nearest product of 3 consecutive integers (three-dimensional oblong).at n=30A342873
• Perimeters of more than one primitive 120-degree integer triangle.at n=20A350047