Values of bsigma(k) = bsigma(k+1), where bsigma is the sum of the bi-unitary divisors (A188999).

Terms

a(0) =24a(1) =40a(2) =60a(3) =720a(4) =960a(5) =1440a(6) =2160a(7) =2640a(8) =2400a(9) =3000a(10) =4320a(11) =4320a(12) =4320a(13) =5280a(14) =7400a(15) =11520a(16) =11880a(17) =12960a(18) =14400a(19) =20160a(20) =30240a(21) =26640a(22) =34560a(23) =25200a(24) =34560a(25) =49920a(26) =51840a(27) =60480a(28) =63360a(29) =60480