Centered heptagonal numbers which are semiprime.

Terms

a(0) =22a(1) =106a(2) =253a(3) =386a(4) =841a(5) =1198a(6) =1618a(7) =2101a(8) =2458a(9) =3046a(10) =3473a(11) =4166a(12) =4411a(13) =5461a(14) =6623a(15) =6931a(16) =7246a(17) =7897a(18) =8926a(19) =9647a(20) =10018a(21) =12811a(22) =13238a(23) =14113a(24) =15947a(25) =16423a(26) =17893a(27) =19951a(28) =22121a(29) =22681