A105336 - OEIS

%I #5 Oct 16 2013 16:38:21

%S 0,1,3,6,10,15,21,28,36,45,55,66,78,91,105,120,8,25,43,62,82,103,125,

%T 20,44,69,95,122,22,51,81,112,16,49,83,118,26,63,101,12,52,93,7,50,94,

%U 11,57,104,24,73,123,46,98,23,77,4,60,117,47,106,38,99,33,96,32,97,35,102,42

%N a(n) = n*(n+1)/2 mod 128.

%t Mod[Accumulate[Range[0,70]],128] (* _Harvey P. Dale_, Oct 16 2013 *)

%Y See A105198 for further information.

%K nonn

%O 0,3

%A _Oscar Takeshita_, May 01 2005