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 A110883 #24 Aug 22 2025 08:51:31
%S A110883 4,5,5,6,14,11,8,11,8,8,13,17,16,16,12,5,5,11,12,10,8,8,10,7,6,11,11,
%T A110883 5,9,16,14,5,2,10,16,12,5,10,16,8,7,15,12,12,18,12,10,12,6,1,5,13,10,
%U A110883 2,9,16,11,13,13,8,9,14,11,5,3,7,15,9,7,10,4,6,8,10,14,8,2,8,17,18,17,14,8
%N A110883 Sum of consecutive digits in the decimal expansion of Pi.
%H A110883 Paolo Xausa, <a href="/A110883/b110883.txt">Table of n, a(n) for n = 1..10000</a>
%H A110883 Blaine Deal, <a href="http://seqpost.notlong.com">Sequence puzzle posting at Clifford Pickover forum</a>. [Broken link]
%H A110883 Blaine Deal, <a href="http://pi314159.notlong.com">Home Page</a>.
%H A110883 Albert Frank and Philippe Jacqueroux, <a href="http://www.paulcooijmans.com/others/intcontest.pdf">International Contest</a>, 2001. Item 25.
%F A110883 a(n) = p(n) + p(n+1) where p(n) is the n-th digit of Pi (see sequence A000796).
%F A110883 a(n) = A000796(n) + A000796(n+1).
%e A110883 a(1)=3+1 = 4, a(2)=1+4 = 5, a(3)=4+1 = 5, a(4)=1+5 = 6, a(5)=5+9 = 14
%t A110883 listlength = 100; Table[IntegerDigits[IntegerPart[10^listlength Pi]][[i]] + IntegerDigits[IntegerPart[10^listlength (Pi - 3.0`100)]][[i]], {i, 1, listlength}]
%t A110883 (* Second program: *)
%t A110883 Total[Partition[First[RealDigits[Pi, 10, 100]], 2, 1], {2}] (* _Paolo Xausa_, Aug 22 2025 *)
%Y A110883 Cf. A000796.
%K A110883 base,nonn
%O A110883 1,1
%A A110883 _Blaine J. Deal_ and _Mark Nandor_, Sep 19 2005
%E A110883 Typo in formula fixed by _Zak Seidov_, Jan 02 2014