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!)
A241812 Triangular numbers which have one or more occurrences of exactly ten different digits. 7
1062489753, 1239845706, 1256984730, 1520843976, 1539264870, 1597283460, 1684930275, 1952843760, 1957346028, 1978236450, 2197480365, 2367098415, 2418079653, 2503948761, 2634980715, 2718609453, 2735891406, 2750483196, 2764518903, 2854316790, 2915768430 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The first term having a repeated digit is a(83) = 10075823946.

Superset of A115940. - R. J. Mathar, May 02 2014

LINKS

Charles R Greathouse IV, Table of n, a(n) for n = 1..10000

MATHEMATICA

Select[Table[(n(n+1))/2, {n, 45000, 100000}], Min[DigitCount[#]]>0&] (* Harvey P. Dale, Jul 26 2014 *)

PROG

(PARI) s=[]; for(n=0, 100000, if(#vecsort(eval(Vec(Str(n*(n+1)/2))), , 8)==10, s=concat(s, n*(n+1)/2))); s

CROSSREFS

Cf. A045914, A062691, A162304, A241787, A241788, A241789, A241790, A241791, A241792, A000217.

Sequence in context: A051020 A221262 A115940 * A049446 A322684 A322694

Adjacent sequences:  A241809 A241810 A241811 * A241813 A241814 A241815

KEYWORD

nonn,base,easy

AUTHOR

Colin Barker, Apr 29 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 September 28 10:51 EDT 2020. Contains 337393 sequences. (Running on oeis4.)