Terms of A338039 that are repeated concatenations of smaller integers.

Terms

a(0) =1818a(1) =8181a(2) =181818a(3) =198198a(4) =405405a(5) =484848a(6) =504504a(7) =565656a(8) =576576a(9) =656565a(10) =675675a(11) =818181a(12) =848484a(13) =891891a(14) =11311131a(15) =13041304a(16) =13111311a(17) =18181818a(18) =19981998a(19) =22622262a(20) =26222622a(21) =33933393a(22) =39333933a(23) =40314031a(24) =41544154a(25) =45144514a(26) =46364636a(27) =63646364a(28) =81818181a(29) =87498749