A138594 Sums of 6 or more consecutive nonnegative integers.

15, 21, 27, 28, 33, 35, 36, 39, 42, 44, 45, 49, 51, 52, 54, 55, 56, 57, 60, 63, 65, 66, 68, 69, 70, 72, 75, 76, 77, 78, 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, 123, 124, 125, 126, 129

Offset

1,1

Comments

Also, the numbers of the form s*k+A000217(k-1), s>=0, k>=6. [From R. J. Mathar, Jul 31 2008]

Links

Robert Israel, Table of n, a(n) for n = 1..10000

Example

0+1+2+3+4+5=15, 1+2+3+4+5+6=21, 2+3+4+5+6+7=27, 1+2+3+4+5+6+7=28, ...

Maple

N:= 1000: # to get all terms <= N
sort(convert({seq(seq(b*(2*a+b-1)/2, a=0..floor(N/b - (b+1)/2)),
b=6..floor((sqrt(1+8*N)-1)/2))}, list)); # Robert Israel, Mar 11 2016

Mathematica

Array[r, 9]; k=0; For[i=0, i<=77, a=i*5+10; For[j=i+5, j<=77, a=a+j; k++; r[k]=a; j++ ]; i++ ]; q=Union[Array[r, k]]; StringTake[ToString[q], 123]

Crossrefs

Sequence in context: A211375 A326387 A217078 * A131651 A134642 A072974

Adjacent sequences: A138591 A138592 A138593 * A138595 A138596 A138597

Keyword

nonn

Author

Vladimir Joseph Stephan Orlovsky, May 13 2008

Extensions

More terms from Vladimir Joseph Stephan Orlovsky, Mar 07 2010

Name edited by Robert Israel, Mar 11 2016

Status

approved