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 A099539 #11 Sep 28 2018 02:55:07 %S A099539 4,5,9,11,12,15,20,26,28,31,38,41,41,50,55,55,59,67,75,75,76,82,90,98, %T A099539 105,107,111,113,113,122,128,137,145,145,152,160,165,171,180,186,193, %U A099539 194,202,209,214,217,224,230,239,243,251,251,258,261,262,269,275,281 %N A099539 Sum of the first n decimal places of sqrt(2). %C A099539 Cf. A099538 for a version of this sequence resulting from including all digits of sqrt(2) and not just the digits after the decimal point. %H A099539 G. C. Greubel, <a href="/A099539/b099539.txt">Table of n, a(n) for n = 1..10000</a> %F A099539 a(n) = A099538(n+1) - 1. %e A099539 Decimal places of sqrt(2) are 41421356237... so sums are 4, 4+1, 4+1+4, 4+1+4+2,... which gives 4, 5, 9, 11, ... %t A099539 Accumulate[Rest[RealDigits[N[Sqrt[2],70]][[1]]]] (* _Harvey P. Dale_, Dec 12 2010 *) %Y A099539 Cf. A099538 and A099534, A099535, A099536, A099537, A039918, A046974, A046975 for analogous sequences based on other constants. %K A099539 base,easy,nonn %O A099539 1,1 %A A099539 Mark Hudson (mrmarkhudson(AT)hotmail.com), Oct 22 2004