A119159 Numbers k such that the k-th triangular number contains only digits {2,4,5}.

9, 10, 225, 714, 6714, 22114, 2119209, 2211449, 102523609, 942573334, 95336514049, 3333030289167658390

Offset

1,1

Comments

Next term exceeds 1.4*10^20.

Links

Table of n, a(n) for n=1..12.

G. Resta, Tridigital Triangular Numbers

Crossrefs

Cf. A000217, A119158. See A119034 for a table of cross-references.

Sequence in context: A041177 A041178 A221201 * A041415 A103869 A041753

Adjacent sequences: A119156 A119157 A119158 * A119160 A119161 A119162

Keyword

nonn,base,more

Author

Giovanni Resta, May 10 2006

Extensions

a(12) from Max Alekseyev, Aug 19 2013

Status

approved