Semiprimes in A056108.

Terms

a(0) =15a(1) =115a(2) =155a(3) =201a(4) =253a(5) =445a(6) =785a(7) =1345a(8) =2215a(9) =3503a(10) =3711a(11) =4145a(12) =4841a(13) =5853a(14) =6395a(15) =7855a(16) =9131a(17) =12353a(18) =13535a(19) =14353a(20) =16503a(21) =18331a(22) =19281a(23) =20255a(24) =20751a(25) =21253a(26) =21761a(27) =23853a(28) =24935a(29) =26603