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 A254528 #46 May 25 2024 16:58:43
%S A254528 1,1,1,2,2,3,3,4,4,4,5,5,6,6,7,7,7,8,8,9,9,10,10,10,11,11,12,12,13,13,
%T A254528 14,14,14,15,15,16,16,17,17,17,18,18,19,19,20,20,20,21,21,22,22,23,23,
%U A254528 24,24,24,25,25,26,26,27,27,27,28,28,29,29,30,30,30,31,31,32,32,33,33
%N A254528 Number of decimal digits in the integer part of e^n.
%H A254528 Benedict W. J. Irwin, <a href="/A254528/b254528.txt">Table of n, a(n) for n = 0..10000</a>
%F A254528 a(n) = A055642(A000149(n)). - _Amiram Eldar_, May 25 2024
%e A254528 e^10 = 22026.46579480671..., so a(10) = 5.
%t A254528 f[n_] := 1 + Floor@ Log10@ Exp@ n; Array[f, 75, 0]
%t A254528 Table[Sum[DigitCount[Floor[Exp[1]^k]][[n]], {n, 1, 10}], {k, 0, 150}] (* _Benedict W. J. Irwin_, Apr 13 2016 *)
%t A254528 IntegerLength[Floor[E^Range[0,80]]] (* _Harvey P. Dale_, Aug 28 2017 *)
%o A254528 (PARI) a(n) = localprec(n+1); #Str(floor(exp(n))); \\ _Michel Marcus_, Dec 05 2020
%Y A254528 Cf. A000149, A055642.
%Y A254528 Cf. A001113, A072334, A091933, A092426, A092511, A092512, A092513 (see their offsets).
%K A254528 base,nonn
%O A254528 0,4
%A A254528 _Robert G. Wilson v_, Feb 01 2015