A056652 Integers > 1 whose prime divisors are all Mersenne primes (i.e. of the form (2^p -1)).

3, 7, 9, 21, 27, 31, 49, 63, 81, 93, 127, 147, 189, 217, 243, 279, 343, 381, 441, 567, 651, 729, 837, 889, 961, 1029, 1143, 1323, 1519, 1701, 1953, 2187, 2401, 2511, 2667, 2883, 3087, 3429, 3937, 3969, 4557, 5103, 5859, 6223, 6561, 6727, 7203, 7533, 8001