%I A069498
%S A069498 0,10,120,190,210,300,630,780,820,990,1540,1770,1830,2080,2850,3160,
%T A069498 3240,3570,4560,4950,5050,5460,6670,7140,7260,7750,9180,9730,9870,
%U A069498 10440,12090,12720,12880,13530,15400,16110,16290,17020,19110,19900
%N A069498 Triangular numbers of the form 10k.
%p A069498 a[0] := 0:a[1] := 4:a[2] := 15:a[3] := 19:seq((20*(floor(i/4))+a[i mod 
               4])*(20*(floor(i/4))+a[i mod 4]+1)/2,i=1..100);
%Y A069498 Sequence in context: A024128 A030022 A069673 this_sequence A024127 A005949 
               A027568
%Y A069498 Adjacent sequences: A069495 A069496 A069497 this_sequence A069499 A069500 
               A069501
%K A069498 nonn
%O A069498 0,2
%A A069498 Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 30 2002
%E A069498 Corrected and extended by Harvey P. Dale (hpd1(AT)nyu.edu) and Sascha 
               Kurz (sascha.kurz(AT)uni-bayreuth.de), Mar 31 2002