Numbers of the form 5^i * 11^j.

Terms

a(0) =1a(1) =5a(2) =11a(3) =25a(4) =55a(5) =121a(6) =125a(7) =275a(8) =605a(9) =625a(10) =1331a(11) =1375a(12) =3025a(13) =3125a(14) =6655a(15) =6875a(16) =14641a(17) =15125a(18) =15625a(19) =33275a(20) =34375a(21) =73205a(22) =75625a(23) =78125a(24) =161051a(25) =166375a(26) =171875a(27) =366025a(28) =378125a(29) =390625