|
|
A068818
|
|
a(n) = smallest triangular number having no digit in common with the previous term, with a(1) = 1.
|
|
1
|
|
|
1, 3, 6, 10, 28, 36, 45, 66, 78, 91, 253, 406, 528, 630, 741, 820, 946, 1035, 2278, 3003, 4186, 5050, 6216, 7503, 8128, 9045, 11628, 33930, 41616, 52003, 61776, 80200, 93961, 200028, 311655, 422740, 511566, 723003, 846951, 3027030, 4114146, 5000703, 6168828
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,2
|
|
LINKS
|
|
|
MATHEMATICA
|
t = {}; p = 1; Do[If[Intersection @@ IntegerDigits /@ {x = n*(n + 1)/2, p} == {}, AppendTo[t, p]; p = x], {n, 2, 5000}]; t (* Jayanta Basu, Aug 07 2013 *)
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,base
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|