A119078 Numbers k such that the k-th triangular number contains only digits {0,4,9}.

44, 2831780, 1407437419, 140715344155

Offset

1,1

Comments

Next term exceeds 1.4*10^16.

Links

Table of n, a(n) for n=1..4.

G. Resta, Tridigital Triangular Numbers

Crossrefs

Cf. A000217, A119077. See A119034 for a table of cross-references.

Sequence in context: A277840 A172828 A115734 * A172878 A001782 A172910

Adjacent sequences: A119075 A119076 A119077 * A119079 A119080 A119081

Keyword

nonn,base,more

Author

Giovanni Resta, May 10 2006

Status

approved