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A072832 First differences of Ulam's sequence A002858.

%I A072832 #31 Apr 19 2019 10:19:03
%S A072832 1,1,1,2,2,3,2,3,2,8,2,8,2,9,1,5,4,5,7,3,5,5,5,10,2,3,4,8,12,5,7,7,3,
%T A072832 7,20,2,3,2,7,8,9,3,10,2,15,2,3,2,10,5,2,13,9,27,7,3,5,15,2,15,2,5,7,
%U A072832 12,8,10,2,7,3,2,15,2,3,7,10,5,27,2,12,5,20,2,20,2,20,2,17,17,3,2,5,12,3
%N A072832 First differences of Ulam's sequence A002858.
%C A072832 No pattern in this sequence has ever been observed, according to Finch.
%C A072832 In the first 49,999,999 terms, 1 occurs four times, 36.9% of the terms are 2, and some terms have not occurred. - _Jud McCranie_, Mar 02 2012
%C A072832 Even though some values seem to get larger as the sequence grows, it appears that the combined frequency of the values 2 and 3 approaches 50%.  This shows up even in the first 10000 terms (combined frequency: 49.9%). - _Enrique Navarrete_, May 08 2017
%D A072832 Steven R. Finch, Mathematical Constants, Cambridge, 2003, pp. 145-151.
%H A072832 Jud McCranie, <a href="/A072832/b072832.txt">Table of n, a(n) for n = 1..10000</a>
%H A072832 Steven R. Finch, <a href="http://www.people.fas.harvard.edu/~sfinch/constant/stlrsky/stlrsky.html">Stolarsky-Harborth Constant</a> [Broken link]
%H A072832 Steven R. Finch, <a href="http://web.archive.org/web/20010207195349/http://www.mathsoft.com/asolve/constant/stlrsky/stlrsky.html">Stolarsky-Harborth Constant</a> [From the Wayback machine]
%Y A072832 Cf. A002858, A072540 (conjectured missing terms).
%K A072832 nonn,easy
%O A072832 1,4
%A A072832 _N. J. A. Sloane_, Jul 25 2002
%E A072832 More terms from _Matthew Conroy_, Aug 24 2002