A056134 Smallest positive integer which is the geometric mean of n and an integer other than n.

2, 4, 6, 2, 10, 12, 14, 4, 3, 20, 22, 6, 26, 28, 30, 4, 34, 6, 38, 10, 42, 44, 46, 12, 5, 52, 9, 14, 58, 60, 62, 8, 66, 68, 70, 6, 74, 76, 78, 20, 82, 84, 86, 22, 15, 92, 94, 12, 7, 10, 102, 26, 106, 18, 110, 28, 114, 116, 118, 30, 122, 124, 21, 8, 130, 132, 134, 34, 138, 140

Offset: 1

Author

Henry Bottomley, Jun 13 2000

Keywords

• easy
• nonn

Formula

a(n)=sqrt(n*A056135(n)). If n is squarefree then a(n)=2n, otherwise a(n)=A019554(n)