This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A077340 #17 Aug 09 2018 03:24:58
%S A077340 1,20,31,42,53,64,75,86,97,108,119,1200,1301,1402,1503,1604,1705,1806,
%T A077340 1907,2008,2109,2210,2311,2412,2513,2614,2715,2816,2917,3018,3119,
%U A077340 3220,3321,3422,3523,3624,3725,3826,3927,4028
%N A077340 Final terms of rows in A077339.
%C A077340 n-th number beginning with n. Can anyone derive a formula for a(n)?
%H A077340 Robert Israel, <a href="/A077340/b077340.txt">Table of n, a(n) for n = 1..10000</a>
%F A077340 From _Robert Israel_, Aug 08 2018: (Start)
%F A077340 a(m+(10^k+8)/9) = 10^k*(m+(10^k+8)/9)+m for 0 <= m < 10^k.
%F A077340 G.f.: (1-x)^(-2)*(x+x^2 + Sum_{k>=1} ((10^(2*k-1)+7*10^(k-1))*x^((10^k+8)/9) + (-10^(2*k-1)+2*10^(k-1))*x^((10^k+17)/9))).
%F A077340 (End)
%p A077340 seq(seq(10^k*(m+(10^k+8)/9)+m, m=0..10^k-1),k=0..3); # _Robert Israel_, Aug 08 2018
%o A077340 (PARI) A077340(n)=A077339(n,n) \\ _M. F. Hasler_, Jan 07 2013
%Y A077340 Cf. A077339, A077341, A077342, A077343.
%K A077340 base,easy,nonn
%O A077340 1,2
%A A077340 _Amarnath Murthy_, Nov 05 2002
%E A077340 Definition corrected by _M. F. Hasler_, Jan 07 2013