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A056135 Smallest positive integer other than n where geometric mean of n and a(n) is an integer. 2
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified October 16 03:28 EDT 2019. Contains 328040 sequences. (Running on oeis4.)