They make the same mistake earlier on: > And associated to the number 55 (5 × 11) would be all multiples of 55 whose smallest prime factor is 11 (therefore exc

They make the same mistake earlier on: > And associated to the number 55 (5 × 11) would be all multiples of 55 whose smallest prime factor is 11 (therefore excluding all multiples of 2, 3, 5 and 7).