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 A100756 #9 Jul 08 2023 15:48:32
%S A100756 11,11,11,11,2157293,37562827,5935701799,18285670562881,
%T A100756 34298587945253,92768668286052709,101410593913295112092414101,
%U A100756 464557485113006356820471,170574866715037030033,829618322366629399154147,2972851397279413777
%N A100756 Greatest prime factor of the concatenation of terms in the n-th row of Pascal's Triangle.
%H A100756 Dario Alejandro Alpern, <a href="https://www.alpertron.com.ar/ECM.HTM">Factorization using the Elliptic Curve Method</a>.
%e A100756 a(4) = 11 is the least prime factor of 14641 = 11^4.
%e A100756 a(5) = 2157293 as 15101051 = 7 * 2157293.
%t A100756 f[n_] := (Table[ #[[1]], {1}] & /@ FactorInteger[ FromDigits[ Flatten[ Table[ IntegerDigits[ Binomial[n, k]], {k, 0, n}]]], FactorComplete -> True])[[ -1, 1]]; Table[ f[n], {n, 10}] (* _Robert G. Wilson v_, Dec 11 2004 *)
%Y A100756 Cf. A100755.
%K A100756 base,easy,nonn
%O A100756 1,1
%A A100756 _Amarnath Murthy_, Nov 23 2004
%E A100756 More terms from _Robert G. Wilson v_, Dec 11 2004