Numbers using only the digits 2 and 5, that are both curved and straight.

Terms

a(0) =2a(1) =5a(2) =22a(3) =25a(4) =52a(5) =55a(6) =222a(7) =225a(8) =252a(9) =255a(10) =522a(11) =525a(12) =552a(13) =555a(14) =2222a(15) =2225a(16) =2252a(17) =2255a(18) =2522a(19) =2525a(20) =2552a(21) =2555a(22) =5222a(23) =5225a(24) =5252a(25) =5255a(26) =5522a(27) =5525a(28) =5552a(29) =5555