A087618 a(n) is the number of pair of consecutive numbers (k,k+1) with k<=10^n such that k and k+1 are both squarefree.

1, 5, 33, 323, 3230, 32269, 322619, 3226343, 32263377, 322634281, 3226340896, 32263409594, 322634100659, 3226340989192

Offset

0,2

Links

Table of n, a(n) for n=0..13.

Eric Weisstein's World of Mathematics, Squarefree

Formula

Asymptotic density is A065474.

Crossrefs

Cf. A071172, A065474.

Sequence in context: A084845 A198079 A098460 * A322178 A134152 A140424

Adjacent sequences: A087615 A087616 A087617 * A087619 A087620 A087621

Keyword

nonn,more

Author

Eric W. Weisstein, Sep 19 2003

Extensions

a(11)-a(13) from Donovan Johnson, Jun 26 2010

Status

approved