Numbers k such that k^2-1 and k^2+1 are semiprimes.

Terms

a(0) =12a(1) =30a(2) =42a(3) =60a(4) =102a(5) =108a(6) =198a(7) =312a(8) =462a(9) =522a(10) =600a(11) =810a(12) =828a(13) =1020a(14) =1050a(15) =1062a(16) =1278a(17) =1452a(18) =1488a(19) =1872a(20) =1950a(21) =2028a(22) =2130a(23) =2142a(24) =2340a(25) =2790a(26) =2802a(27) =2970a(28) =3000a(29) =3120