login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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 (list; graph; refs; listen; history; text; internal format)
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

Cf. A045914, A062691, A162304, A241787, A241788, A241790, A241791, A241792, A241812.

Cf. A000217.

Sequence in context: A235694 A235158 A074669 * A010329 A184567 A034089

Adjacent sequences:  A241786 A241787 A241788 * A241790 A241791 A241792

KEYWORD

nonn,base

AUTHOR

Colin Barker, Apr 28 2014

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 18 18:06 EDT 2021. Contains 345120 sequences. (Running on oeis4.)