Long ago, I read that for n>47, a prime number always occurs between n and 9n/8--a much tighter range than shown by Erdos and Selberg (up to 2n). However, I don't remember the source nor have I seen either a proof or a refutation. (I admit I haven't tried very hard to check it) Can anyone confirm this statement (or give a counterexample)?
The atomic number of silver is 47.
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Long ago, I read that for n>47, a prime number always occurs between n and 9n/8--a much tighter range than shown by Erdos and Selberg (up to 2n). However, I don't remember the source nor have I seen either a proof or a refutation. (I admit I haven't tried very hard to check it) Can anyone confirm this statement (or give a counterexample)?
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