A119120 Numbers k such that the k-th triangular number contains only digits {1,3,8}.

1, 2, 421, 1541, 8753, 150421, 12914246, 1327696379533, 4034385661121, 605166395826533, 16360402306368458, 249752330575267378

Offset: 1

Author

Giovanni Resta, May 10 2006

Keywords

• nonn
• base
• more

Comments

Next term exceeds 4.4*10^18.

Links

• G. Resta, Tridigital Triangular Numbers

Crossrefs

Cf. A000217, A119119. See A119034 for a table of cross-references.

Extensions

Two more terms from Max Alekseyev, May 12 2009