Least positive integer x such that x and n*x are both differences of fourth powers.

Terms

a(0) =1a(1) =179727600a(2) =80a(3) =1040a(4) =16a(5) =2320a(6) =4080a(7) =236187120a(8) =76960a(9) =240a(10) =17680a(11) =76960a(12) =80a(13) =1040a(14) =1a(15) =1a(16) =15a(17) =65520a(18) =4851120a(19) =224991600a(20) =100880a(21) =1728480a(22) =27120a(23) =1389920a(24) =19578624a(25) =1048560a(26) =240a(27) =2986560a(28) =80a(29) =80