25080

Appears in sequences

• [ n(n-1)(n-2)(n-3)/7 ].at n=22A011917
• a(n) = dot_product(1,2,...,n)*(6,7,...,n,1,2,3,4,5).at n=38A026046
• Numbers that, when expressed in base 4 and then interpreted in base 10, yield a multiple of the original number.at n=38A032540
• Number of possible queen moves on an n X n chessboard.at n=19A035005
• Expansion of 1/((1-x)*(1-x^2)^2*(1-x^3)^2*(1-x^4)^2*(1-x^5)*(1-x^6)).at n=31A045513
• Number of nonempty subsets of {1,2,...,n} in which exactly 4/5 of the elements are <= (n-4)/2.at n=26A048068
• Numbers k such that sigma(x) = k has exactly 10 solutions.at n=35A060666
• Numbers k such that the number of steps to reach 1 in '3x+1' problem equals tau(k), the number of divisors of k.at n=32A070980
• Even numbers k such that the central binomial coefficient A000984(k, k/2) is divisible by k^2.at n=15A080395
• Product of the anti-divisors of n.at n=25A091507
• Numbers that can be expressed as the difference of the squares of primes in exactly eight distinct ways.at n=2A092004
• Lcm[{ad(n)}], i.e. the least common multiple of the anti-divisors of n.at n=25A096357
• Areas of 'close-to-equilateral' integer triangles.at n=3A102341
• Area of (m,m+1,m+1)-integer triangle for m in A103975.at n=1A104008
• Area common to integer-sided isosceles triangles (x,x,y) and (x,x,z=y+2d), sorted on x > z/2, d being positive.at n=38A120644
• Triangle T(n, k) = k*(n-1)! - k!, read by rows.at n=32A137260
• Numbers k such that sigma(k) = phi(k)*(sum of the digits of k).at n=3A140173
• Number of permutations of floor(i*5/3), i=0..n-1, with all sums of 3 adjacent terms unique.at n=7A152318
• a(n) = 225*n^2 - 199*n + 44.at n=11A156812
• a(n) = 1331*n - 209.at n=18A157444