A119207 Numbers k such that the k-th triangular number contains only digits {4,5,8}.

9, 10, 9854, 411933209, 9443035090314, 29851116744790, 30195643554810, 3423114221246070, 33433064130720789965334

Offset

1,1

Links

Table of n, a(n) for n=1..9.

Giovanni Resta, Tridigital Triangular Numbers

Crossrefs

Cf. A000217, A119206. See A119034 for a table of cross-references.

Sequence in context: A042729 A156292 A119205 * A165254 A058069 A266703

Adjacent sequences: A119204 A119205 A119206 * A119208 A119209 A119210

Keyword

nonn,base,more

Author

Giovanni Resta, May 10 2006

Extensions

a(9) from Bert Dobbelaere, Mar 15 2026

Status

approved