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A088613 Smallest nonsquarefree multiple of n. 0
4, 4, 9, 4, 20, 12, 28, 8, 9, 20, 44, 12, 52, 28, 45, 16, 68, 18, 76, 20, 63, 44, 92, 24, 25, 52, 27, 28, 116, 60, 124, 32, 99, 68, 140, 36, 148, 76, 117, 40, 164, 84, 172, 44, 45, 92, 188, 48, 49, 50, 153, 52, 212, 54, 220, 56, 171, 116, 236, 60, 244, 124, 63, 64, 260, 132 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..66.

FORMULA

If n is nonsquarefree, then a(n) = n. If n is an even squarefree integer, then a(n) = 2*n. If n is an odd squarefree multiple of 3, then a(n) = 3*n. If n is a squarefree integer not divisible by either 2 or 3, then a(n) = 4*n. a(p) = 4p if p is a prime >= 5. - Leroy Quet, May 14 2008

CROSSREFS

Sequence in context: A023405 A160900 A035116 * A049723 A010661 A051668

Adjacent sequences:  A088610 A088611 A088612 * A088614 A088615 A088616

KEYWORD

easy,nonn

AUTHOR

Amarnath Murthy, Oct 16 2003

EXTENSIONS

More terms from Ray Chandler, Oct 18 2003

STATUS

approved

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Last modified February 23 23:06 EST 2018. Contains 299595 sequences. (Running on oeis4.)