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A119139 Numbers k such that the k-th triangular number contains only digits {1,5,9}. 2
1, 5, 10, 13, 34, 101, 109, 138, 1738, 10114, 19794, 1011090, 1019010, 1054130, 1091010, 34406858, 178858133, 565606858, 4289521091010, 55841058721258 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Next term exceeds 1.4*10^16.

LINKS

Table of n, a(n) for n=1..20.

G. Resta, Tridigital Triangular Numbers

CROSSREFS

Cf. A000217, A119138. See A119034 for a table of cross-references.

Sequence in context: A321558 A328667 A317966 * A313451 A164889 A173553

Adjacent sequences:  A119136 A119137 A119138 * A119140 A119141 A119142

KEYWORD

nonn,base,more

AUTHOR

Giovanni Resta, May 10 2006

STATUS

approved

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Last modified October 21 18:36 EDT 2021. Contains 348155 sequences. (Running on oeis4.)