Numbers n such that n, n-1 and n-2 are semiprimes.

Terms

a(0) =35a(1) =87a(2) =95a(3) =123a(4) =143a(5) =203a(6) =215a(7) =219a(8) =303a(9) =395a(10) =447a(11) =635a(12) =699a(13) =843a(14) =923a(15) =1043a(16) =1139a(17) =1263a(18) =1347a(19) =1403a(20) =1643a(21) =1763a(22) =1839a(23) =1895a(24) =1943a(25) =1983a(26) =2103a(27) =2183a(28) =2219a(29) =2307