The terms of A055237 (sums of two powers of 5) divided by 2.

Terms

a(0) =1a(1) =3a(2) =5a(3) =13a(4) =15a(5) =25a(6) =63a(7) =65a(8) =75a(9) =125a(10) =313a(11) =315a(12) =325a(13) =375a(14) =625a(15) =1563a(16) =1565a(17) =1575a(18) =1625a(19) =1875a(20) =3125a(21) =7813a(22) =7815a(23) =7825a(24) =7875a(25) =8125a(26) =9375a(27) =15625a(28) =39063a(29) =39065