OFFSET
1,3
LINKS
T. D. Noe, Table of n, a(n) for n = 1..1000
MATHEMATICA
trn=SortBy[{First[#], Last[#], Total[#]}& /@ (Union[Sort/@Tuples[Accumulate[Range[0, 70]], {2}]]), Last]; Take[With[{x=Transpose[trn][[3]]}, Complement[Union[x], Union[Flatten[Select[Split[x], Length[#]>1&]]]]], 70] (* Harvey P. Dale, Feb 14 2011 *)
nn=100; tri=Table[n(n+1)/2, {n, 0, nn}]; sums=Select[Flatten[Table[tri[[i]]+tri[[j]], {i, nn}, {j, i}]], #<tri[[-1]]&]; Sort[First/@Select[Tally[sums], #[[2]]==1&]]
PROG
(Haskell)
a119345 n = a119345_list !! (n-1)
a119345_list = filter ((== 1) . a052343) [0..]
-- Reinhard Zumkeller, Jul 25 2014
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, May 15 2006
STATUS
approved