login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A138594 Sums of 6 or more consecutive nonnegative integers. 2
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 (list; graph; refs; listen; history; text; internal format)
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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 1 17:02 EST 2023. Contains 359993 sequences. (Running on oeis4.)