Odd numbers with exactly 2 palindromic prime factors (counted with multiplicity).

Terms

a(0) =9a(1) =15a(2) =21a(3) =25a(4) =33a(5) =35a(6) =49a(7) =55a(8) =77a(9) =121a(10) =303a(11) =393a(12) =453a(13) =505a(14) =543a(15) =573a(16) =655a(17) =707a(18) =755a(19) =905a(20) =917a(21) =939a(22) =955a(23) =1057a(24) =1059a(25) =1111a(26) =1119a(27) =1149a(28) =1267a(29) =1337