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 A088869 #4 Jun 08 2025 16:15:42 %S A088869 5,15,197,591,599,985,23363,70089,182415,32533013,97599039, %T A088869 200814277564911,334690462608185,100208875079675883, %U A088869 119690233947031245,120541110603088381,152213696825889183,167014791799459805 %N A088869 Numbers n which are divisors of the number produced by concatenating (n-1), (n-2), ... (n-5) in that order. %e A088869 a(2)=15 because 15 is a factor of 1413121110. %Y A088869 Cf. A069860, A088797, A088798, A088799, A088800, A088868, A088870, A088871, A088872. %K A088869 base,nonn %O A088869 1,1 %A A088869 _Chuck Seggelin_, Oct 20 2003 %E A088869 More terms from _David Wasserman_, Aug 26 2005