1,1

For k>1: m*10^k are terms for squarefree numbers m coprime to 10;

if m is a term and coprime to 10 then also 10*m is a term.

Table of n, a(n) for n=1..46.

Eric Weisstein's World of Mathematics, Squarefree

Cf. A005117, A013929, A007947, A076333.

Sequence in context: A043146 A043926 A202000 * A092100 A172007 A107258

Adjacent sequences: A118666 A118667 A118668 * A118670 A118671 A118672

nonn,base

Reinhard Zumkeller, May 19 2006

approved