Sums of two powers of 5.

Terms

a(0) =2a(1) =6a(2) =10a(3) =26a(4) =30a(5) =50a(6) =126a(7) =130a(8) =150a(9) =250a(10) =626a(11) =630a(12) =650a(13) =750a(14) =1250a(15) =3126a(16) =3130a(17) =3150a(18) =3250a(19) =3750a(20) =6250a(21) =15626a(22) =15630a(23) =15650a(24) =15750a(25) =16250a(26) =18750a(27) =31250a(28) =78126a(29) =78130