A119072 Numbers k such that the k-th triangular number contains only digits {0,4,5}.

9, 10, 89, 100, 899, 900, 1000, 8989, 9000, 10000, 30134, 31624, 90000, 95289, 100000, 900000, 953944, 1000000, 9000000, 10000000, 10044944, 32880100, 90000000, 100000000, 900000000, 1000000000, 3328800100, 9000000000

Offset

1,1

Links

Table of n, a(n) for n=1..28.

G. Resta, Tridigital Triangular Numbers

Crossrefs

Cf. A000217, A119071. See A119034 for a table of cross-references.

Sequence in context: A249311 A041039 A041176 * A347183 A136867 A136879

Adjacent sequences: A119069 A119070 A119071 * A119073 A119074 A119075

Keyword

nonn,base

Author

Giovanni Resta, May 10 2006

Status

approved