Octagonal numbers equal to S*(3S - 2) with 3S - 2 = k^2 and S semiprime.

Terms

a(0) =96a(1) =225a(2) =1408a(3) =3400a(4) =9633a(5) =22016a(6) =43681a(7) =53600a(8) =93633a(9) =130625a(10) =152776a(11) =205408a(12) =308481a(13) =446216a(14) =696008a(15) =1493896a(16) =1628033a(17) =3280256a(18) =4617761a(19) =4928008a(20) =5595136a(21) =6720033a(22) =8473921a(23) =11721633a(24) =19995008a(25) =20919361a(26) =22863841a(27) =30752008a(28) =33340000