61792

Appears in sequences

• G.f.: (x^2+x-1)*(1+2*x+S)*(1-5*x+2*x^2+(3*x-1)*S)^2*(-1+3*x+2*x^2+(1-x)*S), where S=sqrt(1-4*x).at n=14A135925
• Values of n such that (sigma(sigma(n))-phi(phi(n)))/n is an integer (the corresponding integral ratios are given in A136132).at n=28A136131
• Number of n X 7 arrays of the minimum value of corresponding elements and their horizontal or diagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..1 n X 7 array.at n=15A220031