Number of Primes of Form n^2 + 1/Historical Note

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Historical Note on Number of Primes of Form $n^2 + 1$

According to François Le Lionnais and Jean Brette in their Les Nombres Remarquables of $1983$, this conjecture is the work of Godfrey Harold Hardy and John Edensor Littlewood, but the specific source of this information has not yet been tracked down.