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 A114322 #19 Jul 30 2024 16:44:58 %S A114322 1,3,5,9,17,31,56,99,177,316,562,999,1778,3162,5623,9999,17782,31622, %T A114322 56234,99999,177827,316227,562341,999999,1778279,3162277,5623413, %U A114322 9999999,17782794,31622776,56234132,99999999,177827941,316227766,562341325,999999999,1778279410 %N A114322 Largest number whose 4th power has n digits. %C A114322 This is to 4th powers as A061439 is to cubes and A049416 is to squares. %C A114322 a(n) + A186649(n) + A186651(n) + A186653(n) + A186655(n) + A186657(n) + A186659(n) + A186661(n) + A186663(n) + A186665(n) + A186667(n) + A186669(n) + A186671(n) + A186673(n) + A186675(n) + A186677(n) + A186680(n) + A186682(n) + A186684(n) = A002283(n). %H A114322 Vincenzo Librandi, <a href="/A114322/b114322.txt">Table of n, a(n) for n = 1..1000</a> %F A114322 a(n) = ceiling((10^n)^(1/4)) - 1. %e A114322 a(10) = 316 because 316^4 = 9971220736 which has 10 digits, while 317^4 = 10098039121 has 11 digits. %e A114322 a(35) = 562341325 because 562341325^4 = 99999999864602459914272843469140625 has 35 digits, while 562341326^4 = 100000000575914225104884587789852176 has 36. %t A114322 Ceiling[(10^Range[50])^(1/4)] - 1 (* _Paolo Xausa_, Jul 30 2024 *) %o A114322 (Magma) [Ceiling((10^n)^(1/4))-1: n in [1..40]]; // _Vincenzo Librandi_, Oct 01 2011 %Y A114322 Cf. A061439, A049416. %K A114322 easy,base,nonn %O A114322 1,2 %A A114322 _Jonathan Vos Post_, Feb 06 2006