Numbers k such that k^7 - 1 and k^7 + 1 are semiprimes.

Terms

a(0) =72a(1) =282a(2) =9000a(3) =13932a(4) =19212a(5) =22158a(6) =49920a(7) =65538a(8) =72228a(9) =78888a(10) =144408a(11) =169320a(12) =201492a(13) =201828a(14) =218460a(15) =234540a(16) =270030a(17) =296478a(18) =325080a(19) =355008a(20) =365748a(21) =411000a(22) =448872a(23) =461052a(24) =484152a(25) =504618a(26) =555522a(27) =558252a(28) =586362a(29) =622620