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 A077492 #19 Jun 27 2025 22:22:28
%S A077492 2,4,6,8,1,3,5,7,9,11,13,15,17,19,39,59,79,99,119,139,159,179,199,399,
%T A077492 599,799,999,1199,1399,1599,1799,1999,3999,5999,7999,9999,11999,13999,
%U A077492 15999,17999,19999,39999,59999,79999,99999,119999,139999,159999,179999
%N A077492 a(n) = smallest k such that 5k has a digit sum = n.
%H A077492 <a href="/index/Rec#order_10">Index entries for linear recurrences with constant coefficients</a>, signature (1,0,0,0,0,0,0,0,10,-10).
%F A077492 a(n) = A069534(n)/5.
%F A077492 a(n) = a(n-1) + 10*a(n-9) - 10*a(n-10) for n > 14. - _Georg Fischer_, Oct 26 2020
%t A077492 LinearRecurrence[{1, 0, 0, 0, 0, 0, 0, 0, 10, -10},{2, 4, 6, 8, 1, 3, 5, 7, 9, 11, 13, 15, 17, 19}, 40] (* _Georg Fischer_, Oct 26 2020 *)
%Y A077492 Cf. A069532, A069534.
%K A077492 base,nonn,easy
%O A077492 1,1
%A A077492 _Amarnath Murthy_, Nov 07 2002
%E A077492 More terms from _Ray Chandler_, Jul 28 2003