A119143 - OEIS

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A119143

Numbers k such that the k-th triangular number contains only digits {1,6,8}.

1, 3, 11, 36, 41, 483, 1541, 4041, 36908, 127958, 603136, 1110753, 1795333, 3518005633, 4046896633, 11055868678, 37045070336, 47289885136, 11563893709446, 193226234301588, 194000856277036, 351621434534041

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..22.

G. Resta, Tridigital Triangular Numbers

CROSSREFS

Cf. A000217, A119142. See A119034 for a table of cross-references.

Sequence in context: A147474 A247417 A222286 * A119092 A119177 A213679

Adjacent sequences: A119140 A119141 A119142 * A119144 A119145 A119146

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, May 10 2006

STATUS

approved