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 A131583 #7 May 23 2019 15:34:26
%S A131583 1,14,141,1413,14134,141347,1413472,14134725,141347251,1413472514,
%T A131583 14134725141,141347251417,1413472514173,14134725141734,
%U A131583 141347251417346,1413472514173469,14134725141734693,141347251417346937
%N A131583 Concatenation of first n numbers of the decimal expansion of imaginary part of first nontrivial zero of Riemann zeta function.
%H A131583 <a href="/index/Z#zeta_function">Index entries for zeta function</a>.
%t A131583 Module[{nn=20,zz},zz=RealDigits[Im[ZetaZero[1]],10,nn][[1]];Table[ FromDigits[ Take[zz,n]],{n,nn}]] (* _Harvey P. Dale_, May 23 2019 *)
%Y A131583 See A002410 and A058303 for more information.
%K A131583 easy,nonn,base,less
%O A131583 0,2
%A A131583 _Omar E. Pol_, Sep 13 2007