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 A371751 #12 Sep 04 2025 03:06:31
%S A371751 2,5,2,1,0,0,1,6,1,3,4,2,0,2,1,5,0,6,4,7,7,7,7,4,6,3,1,5,4,7,8,2,1,3,
%T A371751 0,1,3,2,0,6,8,1,8,9,7,8,0,9,1,3,2,6,4,2,6,3,1,2,2,1,7,1,3,9,5,6,2,7,
%U A371751 2,1,0,0,5,0,8,7,0,5,0,0,1,9,7,2,7,6,2,8,0,6,6,3,3,4,7,7,9,9,1,2
%N A371751 Decimal expansion of Product_{k>=0} (1 + 1/5^k).
%H A371751 Kelvin Voskuijl, <a href="/A371751/b371751.txt">Table of n, a(n) for n = 1..20000</a>
%e A371751 2.5210016134202150647777463154782130132...
%t A371751 RealDigits[QPochhammer[-1, 1/5], 10, 100][[1]]
%t A371751 RealDigits[Times@@Table[1+1/5^k,{k,0,1000}],10,100][[1]] (* _Harvey P. Dale_, Sep 17 2024 *)
%Y A371751 Cf. A000351, A081845, A100222, A132323, A371748, A371750, A371752.
%K A371751 nonn,cons,changed
%O A371751 1,1
%A A371751 _Ilya Gutkovskiy_, Apr 05 2024