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 A067114 #6 Dec 05 2013 19:55:07 %S A067114 2,6,12,20,21,21,22,24,25,29,30,36,37,45,47,47,49,51,53,57,59,65,67, %T A067114 75,78,78,81,83,86,90,93,99,102,110,114,114,118,120,124,128,132,138, %U A067114 142,150,155,155,160,162,167,171,176,182,187,195,201,201,207,209,215,219 %N A067114 Let N = 24681012141618202224262830..., the concatenation of the even numbers. Then a(n) = sum of first n digits of N. %e A067114 a(5) = 2+4+6+8+1 = 21. %t A067114 Accumulate[Flatten[IntegerDigits/@Range[2,66,2]]] (* _Harvey P. Dale_, Nov 09 2011 *) %Y A067114 Cf. A067112, A067113. %K A067114 easy,nonn,base %O A067114 1,1 %A A067114 _Amarnath Murthy_, Jan 08 2002 %E A067114 More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 19 2003