%I #7 Mar 23 2016 11:49:13

%S 10,15,20,21,25,27,28,30,33,35,36,39,40,42,44,45,49,50,51,52,54,55,56,

%T 57,60,63,65,66,68,69,70,72,75,76,77,78,80,81,84,85,87,88,90,91,92,93,

%U 95,98,99,100,102,104,105,108,110,111,112,114,115,116,117,119,120,121

%N Sums of 5 or more consecutive nonnegative integers.

%C Also: the numbers of the form s*k+A000217(k-1), s>=0, k>=5. Changing the lower limit to k from 5 to 2, 4 or 6 also defines A138591, A138592 and A138594. [From _R. J. Mathar_, Jul 31 2008]

%H Ray Chandler, <a href="/A138593/b138593.txt">Table of n, a(n) for n = 1..10000</a>

%e 0+1+2=3+4=10, 1+2+3+4+5=15, 2+3+4+5+6=20, 1+2+3+4+5+6=21,...

%t Array[r,9];k=0;For[i=0,i<=55,a=i*4+6;For[j=i+4,j<=66,a=a+j;k++;r[k]=a;j++ ];i++ ];q=Union[Array[r,k]];StringTake[ToString[q],123]

%K nonn

%O 1,1

%A _Vladimir Joseph Stephan Orlovsky_, May 13 2008

%E More terms from _Vladimir Joseph Stephan Orlovsky_, Mar 07 2010