Numbers k such that k-2 and k+2 are consecutive primes.

Terms

a(0) =9a(1) =15a(2) =21a(3) =39a(4) =45a(5) =69a(6) =81a(7) =99a(8) =105a(9) =111a(10) =129a(11) =165a(12) =195a(13) =225a(14) =231a(15) =279a(16) =309a(17) =315a(18) =351a(19) =381a(20) =399a(21) =441a(22) =459a(23) =465a(24) =489a(25) =501a(26) =615a(27) =645a(28) =675a(29) =741