Products of exactly two distinct primes in A090252, in order of appearance.

Terms

a(0) =21a(1) =55a(2) =26a(3) =85a(4) =57a(5) =161a(6) =319a(7) =217a(8) =481a(9) =205a(10) =731a(11) =517a(12) =159a(13) =1121a(14) =1403a(15) =871a(16) =355a(17) =1241a(18) =869a(19) =2407a(20) =1691a(21) =413a(22) =3007a(23) =2323a(24) =206a(25) =1391a(26) =4033a(27) =565a(28) =5207a(29) =2227