For various sieve problems about the distribution of almost-primes our meth-od is still available.

对于相当广泛的一类涉及殆素数分布的筛法问题，我们的方法仍然适用。

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Arithmetic progressions, any one in which consists of 3 primes and 1 almost prime, are investigated.

考察了由3个素数和1个殆素数构成的等差数列。

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