De Polignac's False Conjecture/Historical Note

Historical Note on De Polignac's False Conjecture
proposed his false conjecture in $1848$, claiming that he had verified it up to $3$ million.

This was clearly an exaggeration, as the conjecture fails for the modestly small number $127$.

, in his of $1986$, mentions that this topic is discussed by  in, no. $6$.

This needs to be corroborated.