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 A077493 #5 Dec 05 2013 19:55:53 %S A077493 1001,21,112,14,42,7,35,63,28,56,84,49,77,168,196,98,189,469,497,399, %T A077493 679,896,798,889,1799,2898,2989,3899,4998,6979,5999,8799,9898,9989, %U A077493 29799,19999,39998,58989,59899,68999,79989,99799,89999,199899,389998 %N A077493 a(n) = smallest multiple of 7 with a digit sum = n. %Y A077493 Cf. A069532, A069534, A077494. %K A077493 base,nonn %O A077493 2,1 %A A077493 _Amarnath Murthy_, Nov 07 2002 %E A077493 Corrected and extended by _Sascha Kurz_, Jan 30 2003