Numbers j such that j and 2j are both between a pair of twin primes.

Terms

a(0) =6a(1) =30a(2) =660a(3) =810a(4) =2130a(5) =2550a(6) =3330a(7) =3390a(8) =5850a(9) =6270a(10) =10530a(11) =33180a(12) =41610a(13) =44130a(14) =53550a(15) =55440a(16) =57330a(17) =63840a(18) =65100a(19) =70380a(20) =70980a(21) =72270a(22) =74100a(23) =74760a(24) =78780a(25) =80670a(26) =81930a(27) =87540a(28) =93240a(29) =102300