A156056 - OEIS

%I #2 Mar 30 2012 17:26:28

%S 1,0,1,3,4,8,11,17,22,26,4,4,9,19,26,30,35,49,56,68,12,16,27,33,34,48,

%T 69,85,108,13,115,4,13,39,34,62,75,89,112,128,145,179,182,25,50,86,73,

%U 61,90,130,161,183,226,230,255,18,39,85,108,144,193,195,174,214,267,309

%N n-th triangular number modulo n-th prime.

%t Table[Mod[n(n + 1)/2, Prime[n]], {n, 100}]

%K nonn

%O 1,4

%A _Zak Seidov_, Oct 31 2009