A241791 Triangular numbers which have one or more occurrences of exactly eight different digits.

10348975, 10623745, 10725396, 10869453, 10934826, 12347965, 12357906, 12487503, 12647935, 12673095, 12784096, 13862745, 14756028, 14826735, 15237960, 15298746, 15304278, 15879430, 16247850, 16384950, 17084935, 17502486, 17543926, 17829406

Offset: 1

Author

Colin Barker, Apr 28 2014

Keywords

• nonn
• base

Comments

The first term having a repeated digit is 100642578.

Links

• Colin Barker, Table of n, a(n) for n = 1..2000

Crossrefs

Cf. A045914, A062691, A162304, A241787, A241788, A241789, A241790, A241792, A241812.

Cf. A000217.

Programs

Mathematica

Select[Accumulate[Range[7000]],Length[Union[IntegerDigits[#]]]==8&] (* Harvey P. Dale, Feb 09 2019 *)

PARI

s=[]; for(n=0, 7000, if(#vecsort(eval(Vec(Str(n*(n+1)/2))), , 8)==8, s=concat(s, n*(n+1)/2))); s