A119137 Numbers k such that the k-th triangular number contains only digits {1,5,8}.

1, 5, 10, 101, 130, 1078, 1330, 1541, 4730, 10114, 12773, 13330, 41269, 133330, 1333330, 13333330, 133333330, 1333333330, 3430798394, 5506103010, 13333333330, 108245601470, 133333333330, 1305029950270, 1333333333330

Offset

1,2

Links

Table of n, a(n) for n=1..25.

G. Resta, Tridigital Triangular Numbers

Crossrefs

Cf. A000217, A119136. See A119034 for a table of cross-references.

Sequence in context: A200983 A344140 A267042 * A048360 A357565 A251702

Adjacent sequences: A119134 A119135 A119136 * A119138 A119139 A119140

Keyword

nonn,base

Author

Giovanni Resta, May 10 2006

Status

approved