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A072777 Powers of squarefree numbers which are not squarefree. 2
4, 8, 9, 16, 25, 27, 32, 36, 49, 64, 81, 100, 121, 125, 128, 169, 196, 216, 225, 243, 256, 289, 343, 361, 441, 484, 512, 529, 625, 676, 729, 841, 900, 961, 1000, 1024, 1089, 1156, 1225, 1296, 1331, 1369, 1444, 1521, 1681, 1764, 1849 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

For all n exists k: a(n)=A072774(k) and A072776(k)>1.

LINKS

Table of n, a(n) for n=1..47.

MATHEMATICA

Select[ Range[2000], Length[u = Union[ FactorInteger[#][[All, 2]]]] == 1 && u[[1]] > 1 &] (* Jean-François Alcover, Mar 27 2013 *)

CROSSREFS

Cf. A013929.

Sequence in context: A001694 A157985 A001597 * A076292 A090516 A090515

Adjacent sequences:  A072774 A072775 A072776 * A072778 A072779 A072780

KEYWORD

nonn,nice

AUTHOR

Reinhard Zumkeller, Jul 10 2002

STATUS

approved

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Last modified May 24 21:31 EDT 2013. Contains 225631 sequences.