A119233 Numbers k such that the k-th triangular number contains only digits {6,7,9}.

3, 11, 36, 36817576, 365512507857054543

Offset

1,1

Comments

Next term exceeds 4.4*10^17.

Links

Table of n, a(n) for n=1..5.

G. Resta, Tridigital Triangular Numbers

Crossrefs

Cf. A000217, A119232. See A119034 for a table of cross-references.

Sequence in context: A119161 A119211 A119235 * A178563 A069358 A108544

Adjacent sequences: A119230 A119231 A119232 * A119234 A119235 A119236

Keyword

nonn,base,more

Author

Giovanni Resta, May 10 2006

Extensions

365512507857054543 from Max Alekseyev, Mar 10 2009

Status

approved