Replace n with concatenation of its prime factors in decreasing order.

Terms

a(0) =1a(1) =2a(2) =3a(3) =22a(4) =5a(5) =32a(6) =7a(7) =222a(8) =33a(9) =52a(10) =11a(11) =322a(12) =13a(13) =72a(14) =53a(15) =2222a(16) =17a(17) =332a(18) =19a(19) =522a(20) =73a(21) =112a(22) =23a(23) =3222a(24) =55a(25) =132a(26) =333a(27) =722a(28) =29a(29) =532