Smallest k whose 'Reverse and Subtract' trajectory has a preperiodic part of length n.

Terms

a(0) =0a(1) =1a(2) =10a(3) =16a(4) =14a(5) =15a(6) =13a(7) =1011a(8) =1017a(9) =1037a(10) =1027a(11) =1014a(12) =1013a(13) =1028a(14) =100113a(15) =100104a(16) =100145a(17) =100134a(18) =100103a(19) =100112a(20) =100133a(21) =100187a(22) =100114a(23) =100128a(24) =100194a(25) =100107a(26) =100307a(27) =100277a(28) =100413a(29) =100345