A056135 Smallest positive integer other than n where geometric mean of n and a(n) is an integer.

4, 8, 12, 1, 20, 24, 28, 2, 1, 40, 44, 3, 52, 56, 60, 1, 68, 2, 76, 5, 84, 88, 92, 6, 1, 104, 3, 7, 116, 120, 124, 2, 132, 136, 140, 1, 148, 152, 156, 10, 164, 168, 172, 11, 5, 184, 188, 3, 1, 2, 204, 13, 212, 6, 220, 14, 228, 232, 236, 15, 244, 248, 7, 1, 260, 264, 268, 17

Offset

1,1

Links

Table of n, a(n) for n=1..68.

Formula

a(n)=A056134(n)^2/n. If n is squarefree then a(n)=4n, otherwise a(n)=A007913(n)

Crossrefs

Sequence in context: A126006 A164088 A109239 * A159586 A120230 A086480

Adjacent sequences: A056132 A056133 A056134 * A056136 A056137 A056138

Keyword

easy,nonn

Author

Henry Bottomley, Jun 13 2000

Status

approved