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 A359125 #9 Dec 20 2022 18:49:28
%S A359125 2,13,31,19,6173,123457,154321,333667,333667,3388877,4281283,2630197,
%T A359125 26798700427,8663199947,2523244037,12873492085621702963,
%U A359125 32929947197382727,17539959825403,71595329159622797,325339942922532262019,9999103057380477280607,17465868005034957301,1423364280511
%N A359125 Largest prime factor of A359124(n).
%C A359125 Has the same relation to A359124 as A075032 does to A007908. Suggested by A069048.
%t A359125 FactorInteger[#][[-1,1]]&/@Table[FromDigits[Flatten[IntegerDigits/@Range[n]]]+1,{n,30}] (* _Harvey P. Dale_, Dec 20 2022 *)
%o A359125 (Python)
%o A359125 from sympy import factorint
%o A359125 def a(n): return max(factorint(int("".join(map(str, range(1, n+1)))) + 1))
%o A359125 print([a(n) for n in range(1, 24)]) # _Michael S. Branicky_, Dec 20 2022
%Y A359125 Cf. A007908, A069048, A075032, A359124.
%K A359125 nonn,base
%O A359125 1,1
%A A359125 _N. J. A. Sloane_, Dec 20 2022