1934年,Romanoff证明了:可表为一个素数和一个2的方幂之和的大奇数在全体正整数中具有正密度.本文证明了此密度大于0.09322,从而改进了该问题的已有结果0.0868.作为此问题的推广,本文还建立了一个类似的数值结果:可表为两个素数的平方和两个2的方幂之和的大偶数具有正密度.
In 1934, Romanoff proved that a positive proportion of positive odd integers can be expressed as the sum of a prime and a power of 2. In this paper, we show that the proportion is larger than 0.09322. This improves a previous result with 0.09322 replaced by a smaller value 0.0868. As its generalization, we also establish that a positive proportion of even integers can be written as the sum of two squares of primes and two powers of 2.