The note F on the sixth string is not required, but can be played on the 1st fret if needed. The string 3 (G) is left open.
Scale A# or Bb: Bb Cm Dm Eb F Gm Adim
Note: x or F, Bb, F, G, Db, G
Step: 1-b3-5-61(A#/Bb), b3(C#/Db), 5(F), 6(G)
Alternative names: Bbmin6, Bbm(add6), Bb-6