Numbers with prime factorization p*q*r^3*s^3 (where p, q, r, s are distinct primes).

Terms

a(0) =7560a(1) =11880a(2) =14040a(3) =16632a(4) =18360a(5) =19656a(6) =20520a(7) =21000a(8) =24840a(9) =25704a(10) =28728a(11) =30888a(12) =31320a(13) =33000a(14) =33480a(15) =34776a(16) =39000a(17) =39960a(18) =40392a(19) =41160a(20) =43848a(21) =44280a(22) =45144a(23) =46440a(24) =46872a(25) =47250a(26) =47736a(27) =50760a(28) =51000a(29) =53352