A138593 Sums of 5 or more consecutive nonnegative integers.

10, 15, 20, 21, 25, 27, 28, 30, 33, 35, 36, 39, 40, 42, 44, 45, 49, 50, 51, 52, 54, 55, 56, 57, 60, 63, 65, 66, 68, 69, 70, 72, 75, 76, 77, 78, 80, 81, 84, 85, 87, 88, 90, 91, 92, 93, 95, 98, 99, 100, 102, 104, 105, 108, 110, 111, 112, 114, 115, 116, 117, 119, 120, 121

Offset: 1

Author

Vladimir Joseph Stephan Orlovsky, May 13 2008

Keywords

• nonn

Comments

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]

Examples

			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,...
		

Links

• Ray Chandler, Table of n, a(n) for n = 1..10000

Programs

Mathematica

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]

Extensions

More terms from Vladimir Joseph Stephan Orlovsky, Mar 07 2010