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A119217 Numbers n such that the n-th triangular number contains only digits {4,7,8}. 2
12, 132, 947, 1332, 3867, 13332, 133332, 299492, 1222692, 1333332, 13333332, 133333332, 1333333332, 3944306652, 13333333332, 122020365307, 133333333332, 394329425347, 988724307827, 1333333333332, 12528986215052 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

LINKS

G. Resta, Tridigital Triangular Numbers

CROSSREFS

Cf. A000217, A119216. See A119034 for a table of cross-references.

Sequence in context: A048643 A111085 A002721 * A119237 A038729 A125447

Adjacent sequences:  A119214 A119215 A119216 * A119218 A119219 A119220

KEYWORD

nonn,base

AUTHOR

Giovanni Resta (g.resta(AT)iit.cnr.it), May 10 2006

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Last modified February 16 21:51 EST 2012. Contains 205978 sequences.