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
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