Voozh

A140809

10^n-th squarefree number > 1.

2, 15, 165, 1639, 16447, 164499, 1644919, 16449370, 164493391, 1644934082, 16449340710, 164493406181, 1644934067513, 16449340668749, 164493406685661, 1644934066850411, 16449340668485217, 164493406684817903, 1644934066848209911, 16449340668482311683, 164493406684822636378, 1644934066848226473466

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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.

LINKS

Table of n, a(n) for n=0..21.

CROSSREFS

Cf. A005117, A013661.