2920533domain: NAppears in sequencesCyclops octagonal numbers: a(n) = n*(3*n-2) with one "zero" digit in the middle.at n=26A285767Total number of distinct numbers that can be obtained by starting with 1 and applying the "Choix de Bruxelles", version 2 operation at most n times in ternary (base 3).at n=16A356715