A140809 10^n-th squarefree number.

2, 15, 165, 1639, 16447, 164499, 1644919, 16449370, 164493391, 1644934082, 16449340710, 164493406181, 1644934067513, 16449340668749, 164493406685661, 1644934066850411, 16449340668485217, 164493406684817903, 1644934066848209911

Offset

0,1

Comments

a(n)=A005117(10^n) with offset 0.

References

J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 165, pp 53, Ellipses, Paris 2008.

Links

Table of n, a(n) for n=0..18.

Crossrefs

Cf. A005117.

Sequence in context: A364331 A259608 A317278 * A153852 A177396 A324151

Adjacent sequences: A140806 A140807 A140808 * A140810 A140811 A140812

Keyword

nonn

Author

Lekraj Beedassy, Jul 15 2008

Extensions

a(10)-a(12) from Donovan Johnson, Nov 06 2010

a(13)-a(18) from Robert Gerbicz, Nov 22 2010

Status

approved