5142500domain: NAppears in sequencesNumbers k such that both k and k + 1 are logarithmically smooth.at n=18A116486a(n) = n^5 - n^3 - n^2.at n=22A133070Largest number x such that x and x+1 are prime(n)-smooth but not prime(n-1)-smooth.at n=8A145606Numbers k such that k | A020696(k) and (k+1) | A020696(k+1).at n=26A355332