1,1

f[n_] := Plus @@ Select[ Divisors[n], Sqrt[n/2] <= # < Sqrt[n*2] &]; s = 0; k = 0; Do[ While[k < 10^n, k++; If[ f[k] != 0, s++ ]]; Print[s], {n, 1, 7}]

Cf. A071540.

Sequence in context: A098665 A153397 A005786 this_sequence A146966 A090010 A062266

Adjacent sequences: A071538 A071539 A071540 this_sequence A071542 A071543 A071544

nonn

Robert G. Wilson v (rgwv(AT)rgwv.com), May 31 2002