A119235 Numbers k such that the k-th triangular number contains only digits {6,8,9}.

3, 11, 36, 371211, 421186108, 1180677745929588

Offset

1,1

Comments

Next term exceeds 4.4*10^18.

Links

Table of n, a(n) for n=1..6.

G. Resta, Tridigital Triangular Numbers

Crossrefs

Cf. A000217, A119234. See A119034 for a table of cross-references.

Sequence in context: A048361 A119161 A119211 * A119233 A178563 A069358

Adjacent sequences: A119232 A119233 A119234 * A119236 A119237 A119238

Keyword

nonn,base,more

Author

Giovanni Resta, May 10 2006

Extensions

Lower bound updated by Max Alekseyev, Apr 30 2010

Status

approved