Numbers k such that k, k+1 and k+2 are products of two primes.

Terms

a(0) =33a(1) =85a(2) =93a(3) =121a(4) =141a(5) =201a(6) =213a(7) =217a(8) =301a(9) =393a(10) =445a(11) =633a(12) =697a(13) =841a(14) =921a(15) =1041a(16) =1137a(17) =1261a(18) =1345a(19) =1401a(20) =1641a(21) =1761a(22) =1837a(23) =1893a(24) =1941a(25) =1981a(26) =2101a(27) =2181a(28) =2217a(29) =2305