A066713 RATS(n): Reverse Add Then Sort the digits of 2^n.

2, 4, 8, 16, 77, 55, 11, 499, 89, 277, 2255, 145, 11, 1111, 44567, 111499, 12299, 1234, 3467, 113467, 677789, 144556, 1222889, 14445667, 4577789, 55669999, 1134899, 11356999, 12237899, 445557799, 1223555555, 11113366, 1122222266