Numbers of the concatenated form 9nn9.

Terms

a(0) =9009a(1) =9119a(2) =9229a(3) =9339a(4) =9449a(5) =9559a(6) =9669a(7) =9779a(8) =9889a(9) =9999a(10) =910109a(11) =911119a(12) =912129a(13) =913139a(14) =914149a(15) =915159a(16) =916169a(17) =917179a(18) =918189a(19) =919199a(20) =920209a(21) =921219a(22) =922229a(23) =923239a(24) =924249a(25) =925259a(26) =926269a(27) =927279a(28) =928289a(29) =929299