1,1

Table of n, a(n) for n=1..60.

A280296(1)=6, 2^6-1 = 63 = 3*3*7, so 63 is not squarefree the square being 3*3=9.

Cf. A280296, A283245.

Sequence in context: A007037 A179280 A293095 * A249780 A140891 A072461

Adjacent sequences: A283089 A283090 A283091 * A283093 A283094 A283095

nonn

Robert Price, Mar 06 2017

approved