Answer:
55, 54, 51, 46, 43,40,37,34,31,28,25,22, 19
39, 30
55-54=1
54-51=3
51-46=5
46-39=7
39-30=9
30-19=11
55-1=54
54-3=51
51-5=46
46-7=39
39-9=30
30-11=19
pattern: decreased by odd numbers
