26870

Appears in sequences

• Number of k's less than or equal to 10^n such that there are middle divisors of k (A071562).at n=4A071541
• Triangle of coefficients of polynomials P(n; x) = Permanent(M), where M=[m(i,j)] is n X n matrix defined by m(i,j)=x if 0<=i-j<=2 else m(i,j)=1.at n=50A080061
• Records for minima of the positive distance d between the seventh power of a positive integer x and the square of an integer y such that d = x^7 - y^2 (x <> k^2 and y <> k^7).at n=10A179784
• Number of (w,x,y,z) with all terms in {1,...,n} and 3w=x+y+z+n.at n=40A212247
• Harary index of the n X n black bishop graph.at n=24A296198