OFFSET
1,1
COMMENTS
The first term having a repeated digit is 1004653.
LINKS
Colin Barker, Table of n, a(n) for n = 1..2500
MATHEMATICA
Select[Table[(n(n+1))/2, {n, 447, 681}], Length[Union[ IntegerDigits[ #]]] == 6&] (* Harvey P. Dale, Feb 17 2018 *)
PROG
(PARI) s=[]; for(n=0, 800, if(#vecsort(eval(Vec(Str(n*(n+1)/2))), , 8)==6, s=concat(s, n*(n+1)/2))); s
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Colin Barker, Apr 28 2014
STATUS
approved