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A140809
10^n-th squarefree number > 1.
1
2, 15, 165, 1639, 16447, 164499, 1644919, 16449370, 164493391, 1644934082, 16449340710, 164493406181, 1644934067513, 16449340668749, 164493406685661, 1644934066850411, 16449340668485217, 164493406684817903, 1644934066848209911, 16449340668482311683, 164493406684822636378, 1644934066848226473466
OFFSET
0,1
COMMENTS
a(n) = A005117(10^n+1).
a(n)/10^n converges to Pi^2/6 = zeta(2) as n -> oo. - Chai Wah Wu, Jul 21 2024
REFERENCES
J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 165, pp 53, Ellipses, Paris 2008.
CROSSREFS
Sequence in context: A364331 A259608 A317278 * A153852 A177396 A324151
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
a(19)-a(21) from Chai Wah Wu, Aug 07 2024
STATUS
approved