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a(n) = n*(n+1)/2 mod 1024.
0

%I #5 Jun 30 2017 11:27:51

%S 0,1,3,6,10,15,21,28,36,45,55,66,78,91,105,120,136,153,171,190,210,

%T 231,253,276,300,325,351,378,406,435,465,496,528,561,595,630,666,703,

%U 741,780,820,861,903,946,990,11,57,104,152,201,251,302,354,407,461,516,572,629

%N a(n) = n*(n+1)/2 mod 1024.

%t Mod[Accumulate[Range[0,100]],1024] (* _Harvey P. Dale_, Jun 30 2017 *)

%Y See A105198 for further information.

%K nonn

%O 0,3

%A _Oscar Takeshita_, May 01 2005