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

Terms

a(0) =1a(1) =3a(2) =6a(3) =15a(4) =35a(5) =70a(6) =105a(7) =210a(8) =357a(9) =420a(10) =1045a(11) =1485a(12) =2090a(13) =2970a(14) =3135a(15) =3339a(16) =5049a(17) =5940a(18) =6270a(19) =10659a(20) =12441a(21) =12540a(22) =16065a(23) =24871a(24) =24969a(25) =29029a(26) =33915a(27) =35343a(28) =39105a(29) =39585