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 A262438 #15 Dec 14 2015 05:18:55 %S A262438 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, %T A262438 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, %U A262438 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2 %N A262438 Number of digits of hexadecimal representation of n. %C A262438 Length of n-th row in A262437. %H A262438 Reinhard Zumkeller, <a href="/A262438/b262438.txt">Table of n, a(n) for n = 0..10000</a> %p A262438 A262438 := proc(n) %p A262438 if n =0 then %p A262438 1; %p A262438 else %p A262438 1+floor(log[16](n)) ; %p A262438 end if; %p A262438 end proc: # _R. J. Mathar_, Dec 14 2015 %o A262438 (Haskell) %o A262438 a262438 = length . a262437_row %o A262438 (PARI) a(n) = if (n, #digits(n, 16), 1); \\ _Michel Marcus_, Dec 14 2015 %Y A262438 Cf. A262437, A055642, A070939, A081604. %K A262438 nonn,base %O A262438 0,17 %A A262438 _Reinhard Zumkeller_, Sep 22 2015