A119050 Numbers k such that the k-th triangular number contains only digits {0,2,3}.

2, 24, 77, 215, 637, 802, 8002, 25815, 80002, 800002, 2158797, 8000002, 25768322, 66382562, 80000002, 800000002, 8000000002, 21596311362, 80000000002, 800000000002, 8000000000002, 80000000000002, 800000000000002

Offset: 1

Author

Giovanni Resta, May 10 2006

Keywords

• nonn
• base

Links

• G. Resta, Tridigital Triangular Numbers

Crossrefs

Cf. A000217, A119049. See A119034 for a table of cross-references.

Programs

Magma

[n: n in [1..2*10^7] | Set(Intseq(Binomial(n+1, 2))) subset [0, 2, 3]]; // Vincenzo Librandi, Oct 07 2015

Mathematica

Select[Range[3 10^7], Complement[IntegerDigits[Binomial[# + 1, 2]], {0, 2, 3}] == {}&] (* Vincenzo Librandi,Oct 07 2015 *)