Numbers whose base-6 representation is the juxtaposition of two identical strings.

Terms

a(0) =7a(1) =14a(2) =21a(3) =28a(4) =35a(5) =222a(6) =259a(7) =296a(8) =333a(9) =370a(10) =407a(11) =444a(12) =481a(13) =518a(14) =555a(15) =592a(16) =629a(17) =666a(18) =703a(19) =740a(20) =777a(21) =814a(22) =851a(23) =888a(24) =925a(25) =962a(26) =999a(27) =1036a(28) =1073a(29) =1110