Numbers k such that sigma(k) AND 3*k = 3*k, where AND is bitwise-and, A004198.

Terms

a(0) =120a(1) =480a(2) =672a(3) =720a(4) =960a(5) =1344a(6) =1800a(7) =1920a(8) =2352a(9) =2688a(10) =3840a(11) =4680a(12) =5220a(13) =5376a(14) =5616a(15) =6840a(16) =7344a(17) =7680a(18) =8880a(19) =9600a(20) =9720a(21) =10296a(22) =10752a(23) =10944a(24) =14256a(25) =15360a(26) =16416a(27) =16560a(28) =17100a(29) =19200