OFFSET
1,1
LINKS
Robert Israel, Table of n, a(n) for n = 1..10001
FORMULA
MAPLE
N:= 10^10: # to get all terms <= N
{seq(seq(9^a+9^b, b=0..a-1), a=1..floor(log[9](N)))}; # Robert Israel, Aug 31 2014
MATHEMATICA
Total/@Subsets[9^Range[0, 10], {2}]//Union (* Harvey P. Dale, Aug 25 2023 *)
PROG
(PARI) for(a=0, 19, for(b=0, a-1, print1(9^a+9^b, ", "))) \\ M. F. Hasler, Aug 31 2014
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
EXTENSIONS
More terms from Vincenzo Librandi, Aug 06 2009
Corrected by Harvey P. Dale, Aug 31 2014
Offset changed from 0 to 1 by M. F. Hasler, Aug 31 2014
STATUS
approved