93176

Appears in sequences

• 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=30A136131
• Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row and column sum not 2 4 5 or 7 and every diagonal and antidiagonal sum 2 4 5 or 7.at n=7A251871
• G.f. A(x,y) satisfies: A(x,y) = x + A( x^2 + x*y*A(x,y)^2, y).at n=76A271868
• Triangle read by rows: T(n,k) is the number of derangements in S_n with no k-cycles. 1 <= k <= n.at n=44A378495