Odd powerful numbers (A062739) k such that the next powerful number after k is also odd.

Terms

a(0) =25a(1) =121a(2) =225a(3) =343a(4) =1089a(5) =1323a(6) =2187a(7) =2197a(8) =3025a(9) =3087a(10) =3249a(11) =5929a(12) =6125a(13) =6859a(14) =7803a(15) =8575a(16) =9261a(17) =10125a(18) =11881a(19) =11907a(20) =14161a(21) =15125a(22) =16641a(23) =16807a(24) =19683a(25) =19773a(26) =21025a(27) =22707a(28) =25921a(29) =27889