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 A342047 #11 Feb 28 2021 09:54:49 %S A342047 0,1,2,10,3,11,4,5,12,13,14,6,7,15,16,8,9,17,18,19,20,21,30,31,32,100, %T A342047 40,41,42,101,43,102,103,104,44,45,46,47,48,49,50,51,52,105,106,53, %U A342047 107,54,60,61,62,108,63,109,64,65,110,66,67,68,69,70,71,72,111,73,112,113,114,74,75,115,116 %N A342047 When a digit d is prime, the next digit is < d. %C A342047 After a(1) = 0, the sequence is always extended with the smallest positive integer not yet present that doesn't lead to a contradiction. %H A342047 Rémy Sigrist, <a href="/A342047/b342047.txt">Table of n, a(n) for n = 1..10000</a> %H A342047 Rémy Sigrist, <a href="/A342047/a342047.gp.txt">PARI program for A342047</a> %o A342047 (PARI) See Links section. %Y A342047 Cf. A342042, A342043, A342044, A342045 and A342046 (variations on the same idea). %K A342047 base,nonn %O A342047 1,3 %A A342047 _Eric Angelini_, Feb 26 2021