A119124 Numbers k such that the k-th triangular number contains only digits {1,4,5}.

1, 5, 9, 10, 101, 298, 301, 1761, 10113, 10114, 15133, 91010, 297134, 3329010, 10406301, 15133698, 30180826, 47989885, 101434130, 301468258, 942805541, 9544151561, 16977369885, 95335633898

Offset

1,2

Comments

Next term exceeds 1.4*10^16.

Links

Table of n, a(n) for n=1..24.

G. Resta, Tridigital Triangular Numbers

Crossrefs

Cf. A000217, A119123. See A119034 for a table of cross-references.

Sequence in context: A227853 A275240 A175437 * A326769 A331005 A131634

Adjacent sequences: A119121 A119122 A119123 * A119125 A119126 A119127

Keyword

nonn,base,more

Author

Giovanni Resta, May 10 2006

Status

approved