257499domain: NAppears in sequencesSmaller of two consecutive numbers with the same prime signature not occurring earlier.at n=19A085929Numbers n such that n and n+1 both have 30 divisors.at n=1A274365a(n) is the least number k such that A048105(k) = A048105(k+1) = 2*n, and 0 if it does not exist.at n=11A344315