51088

Appears in sequences

• Number of 5-tuples of different integers from [ 1,n ] with no common factors among pairs.at n=42A015698
• Numbers d*p where d is a perfect number and p<d a prime not dividing d.at n=34A165772
• Number of 4X4X4 triangular 0..n arrays with every horizontal row nondecreasing and having the same average value.at n=11A214908