931157domain: NAppears in sequencesOdd numbers producing exactly 3 odd numbers in the Collatz (3x+1) iteration.at n=31A198584Odd numbers producing 3 decreasing odd numbers in the Collatz (3x+1) iteration.at n=28A228872Numbers of the form (2^(2*j + 6*k + 5) - 2^(2*j + 1) - 3)/9, with j,k >= 0.at n=19A342815