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A241789
Triangular numbers which have one or more occurrences of exactly six different digits.
7
102378, 103285, 104653, 106953, 108345, 109278, 109746, 120786, 124750, 132870, 135460, 137026, 138075, 150426, 152076, 154290, 158203, 162735, 168490, 170236, 174936, 178503, 189420, 190653, 194376, 197506, 198765, 203841, 205761, 215496, 219453, 231540
OFFSET
1,1
COMMENTS
The first term having a repeated digit is 1004653.
LINKS
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
KEYWORD
nonn,base
AUTHOR
Colin Barker, Apr 28 2014
STATUS
approved