I SHALL begin with a method of proving that the number of prime numbers is infinite which is not new, but which it is worth while to recall as an introduction to a similar method, by series, which will subsequently be employed in order to prove that the number of primes of the form 4n + 3, as also of the form 6n + 5, is infinite.
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SYLVESTER, J. On Certain Inequalities Relating to Prime Numbers . Nature 38, 259–262 (1888). https://doi.org/10.1038/038259b0