Numbers k such that k, 2*k and 4*k are balanced numbers (A020492).

Terms

a(0) =3a(1) =35a(2) =105a(3) =210a(4) =1045a(5) =1485a(6) =2970a(7) =3135a(8) =6270a(9) =24871a(10) =29029a(11) =35343a(12) =39105a(13) =50065a(14) =58435a(15) =64285a(16) =70686a(17) =71145a(18) =74613a(19) =78210a(20) =87087a(21) =87685a(22) =124605a(23) =137885a(24) =140335a(25) =142290a(26) =149226a(27) =150195a(28) =174174a(29) =175305