64650

Appears in sequences

• Numbers k such that pi(k) divides k.at n=42A057809
• Consider the sequence {b(m)} of nonprimes; sequence gives values of m where gcd{m, b(m)} increases.at n=42A058011
• Numbers n such that pi(n) = (1/10)*n.at n=4A165689
• Triangle read by rows: T(n,k) is the number of weighted lattice paths in L_n having k peaks.The members of L_n are paths of weight n that start at (0,0), end on the horizontal axis and whose steps are of the following four kinds: an (1,0)-step with weight 1, an (1,0)-step with weight 2, a (1,1)-step with weight 2, and a (1,-1)-step with weight 1. The weight of a path is the sum of the weights of its steps. A peak is a (1,1)-step followed by a (1,-1)-step.at n=53A182903
• Number of nXnXn triangular 0..1 arrays with new values introduced in sequential zero-upwards order and exactly one upright 2x2x2 triangle having values all equal.at n=5A271333
• T(n,k)=Number of nXnXn triangular 0..k arrays with new values introduced in sequential zero-upwards order and exactly one upright 2x2x2 triangle having values all equal.at n=20A271339