Semiprimes whose prime factors are the digit reversal of each other.

Terms

a(0) =4a(1) =9a(2) =25a(3) =49a(4) =121a(5) =403a(6) =1207a(7) =2701a(8) =7663a(9) =10201a(10) =17161a(11) =22801a(12) =32761a(13) =35143a(14) =36481a(15) =75007a(16) =97969a(17) =117907a(18) =124609a(19) =127087a(20) =139129a(21) =140209a(22) =146689a(23) =173809a(24) =197209a(25) =247021a(26) =257821a(27) =342127a(28) =382387a(29) =528529