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 A283514 #23 Feb 16 2025 08:33:42 %S A283514 3,43,543,6543,76543,876543,9876543,109876543,11109876543, %T A283514 1211109876543,131211109876543,14131211109876543,1514131211109876543, %U A283514 161514131211109876543,17161514131211109876543,1817161514131211109876543,191817161514131211109876543 %N A283514 Concatenation of the numbers from n down to 3. %C A283514 The a(3) = 3, a(4) = 43, a(7) = 76543, a(46) = 464544...876543 are primes in this sequence (for n < 2823). %H A283514 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ConsecutiveNumberSequences.html">Consecutive Number Sequences</a> %Y A283514 Cf. A000422, A176024, A284891. %K A283514 base,nonn,easy %O A283514 3,1 %A A283514 _XU Pingya_, Apr 14 2017