Refactorable numbers k such that 2*k + 1 is also a refactorable number.

Terms

a(0) =3280a(1) =6160a(2) =8320a(3) =51520a(4) =99904a(5) =174640a(6) =386320a(7) =541840a(8) =883120a(9) =1690960a(10) =2062480a(11) =2365312a(12) =2688880a(13) =2959744a(14) =3077680a(15) =3152560a(16) =3274240a(17) =5375920a(18) =6885760a(19) =8925312a(20) =10030720a(21) =11219584a(22) =11912080a(23) =12058960a(24) =14370160a(25) =15854080a(26) =18966640a(27) =21839440a(28) =22038160a(29) =24787840