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 A143617 #22 Jul 20 2020 01:59:49
%S A143617 0,8,10,18,20,28,68,88,108,188,200,208,288,688,888,1088,1888,2008,
%T A143617 2088,2888,6888,8888,10888,18888,20088,20888,28888,68888,88888,108888,
%U A143617 188888,200888,208888,288888,688888,888888,1088888,1888888,2008888,2088888
%N A143617 Where record values occur in A010371.
%C A143617 a(n) is the least number using n + 6 (or n + 5 for n < 5) segments on a 7-segment display, when '6' uses 6 segments. This is essentially the same as A038619 (starts with 1, 2, 6 instead of 0) and A216261 (= a(n) uses n segments: has 4 values before 0 and 22 before 20). - _M. F. Hasler_, Jun 17 2020
%H A143617 <a href="/index/Rec#order_08">Index entries for linear recurrences with constant coefficients</a>, signature (1,0,0,0,0,0,10,-10).
%F A143617 a(n+7) = 10*a(n) + 8 for n > 4.
%F A143617 A010371(a(n)) = A143616(n) and A010371(m) < A143616(n) for m < a(n).
%F A143617 A010371(a(n)) = n + 6 for n > 4. - _M. F. Hasler_, Jun 23 2020
%F A143617 a(n) = a(n-1) + 10*a(n-7) - 10*a(n-8). - _Wesley Ivan Hurt_, Jul 03 2020
%t A143617 Block[{f, s}, MapIndexed[(f[#2[[1]] - 1] = #1) &, {6, 2, 5, 5, 4, 5, 6, 4, 7, 6}]; s = Array[Total[f /@ IntegerDigits[#]] &, 10^6, 0]; Map[-1 + FirstPosition[s, #][[1]] &, Union@ FoldList[Max, s]]] (* _Michael De Vlieger_, Jun 23 2020 *)
%o A143617 (PARI) apply( {A143617(n)=if(n>11,self()(n-7)*10+8, n>9, 12*n+68, n>6, 20*n-72, n*5-2-n%2*3)}, [1..55]) \\ _M. F. Hasler_, Jun 23 2020
%Y A143617 Cf. A010371, A143616.
%K A143617 nonn
%O A143617 1,2
%A A143617 _Reinhard Zumkeller_, Aug 27 2008