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 A110803 #18 Mar 23 2023 18:29:06 %S A110803 1,2,3,4,5,6,7,8,9,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48,50,52, %T A110803 54,56,58,60,62,64,66,68,70,72,74,76,78,80,82,84,86,88,90,92,94,96,98, %U A110803 100,102,104,106,108,110,112,114,116,118,120,122,124,126,128 %N A110803 n times the number of digits in the decimal expansion of n. %H A110803 Indranil Ghosh, <a href="/A110803/b110803.txt">Table of n, a(n) for n = 1..10000</a> %F A110803 a(n) = n * A055642(n). - _Indranil Ghosh_, Jan 11 2017 %e A110803 a(1234) = 4936 = 1234*4. %t A110803 # IntegerLength[#]&/@Range[60] (* _Harvey P. Dale_, Mar 04 2011 *) %o A110803 (Python) %o A110803 def A110803(n): %o A110803 return n*len(str(n)) # _Indranil Ghosh_, Jan 11 2017 %Y A110803 Cf. A055642. %K A110803 base,easy,nonn %O A110803 1,2 %A A110803 _Amarnath Murthy_, Aug 14 2005 %E A110803 Corrected by _T. D. Noe_, Oct 25 2006