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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
OFFSET
1,2
LINKS
Jayanta Basu and T. D. Noe, Table of n, a(n) for n = 1..100 (first 69 terms from Jayanta Basu)
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
Sequence in context: A364170 A211231 A302094 * A068866 A137173 A116544
KEYWORD
nonn,base
AUTHOR
Amarnath Murthy, Mar 07 2002
EXTENSIONS
Corrected and extended by Sascha Kurz, Mar 27 2002
Additional terms from Jayanta Basu, Aug 07 2013
STATUS
approved