By combining the sieve machinery used in the author's previous paper on this topic and some new arithmetic information in Harman's monograph, the author proves that the interval n-n^1{22+}, n contains prime numbers for almost all n, improving the previous exponent 121. 5 by the author. The use of the variable role-reversal plays a crucial role in the proof.
Runbo Li (Fri,) studied this question.