Published online by Cambridge University Press: 24 October 2008
In a previous paper I proved that the density of the positive integers of the form where the letters p, q, and later P, Q, r, denote primes, is positive. As indicated in the Introduction of I, I now give proofs of the following results:
The density of each of the sets of integers
is positive.
† See, for example Landau, E., Göttinger Nachr. (1930), 255–76,Google Scholar Satz 21.
‡ Vinogradov has recently proved that every large number of the form 24k + 5 is the sum of 5 squares of primes. See C.R. Acad. Sci. U.R.S.S. 16 (1937), 131–2.Google Scholar
* Titchmarsh, E. C., Rendiconli Circ. mat. Palermo, 54 (1930), 416.Google Scholar
* Ramanujan, S., Collected papers (Cambridge, 1927), pp. 262–75.Google Scholar
* S. Ramanujan, op. cit.
* a′i and a′j here run through the integers of Lemma 6.
† π(x) denotes the number of primes not exceeding x.
* Erdös, P., Quart. J. Math. 6 (1935), 205–13.CrossRefGoogle Scholar
* S. Ramanujan, op. cit.
† J. London Math. Soc. 10 (1935), 126–8.Google Scholar
‡ J. London Math. Soc. 11 (1936), 92–8.Google Scholar
* For it follows from Lemma 3 of I that the number of solutions of α1 = p′ν − p ν with is less than