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A119109 Triangular numbers composed of digits {1,2,9}. +0
3
1, 21, 91, 2211, 222111, 22221111, 229119121, 291212911, 2222211111, 222222111111, 299992122991, 1122921211191, 22222221111111, 2222222211111111, 21212929921912191, 222222222111111111 (list; graph; listen)
OFFSET

1,2
LINKS

G. Resta, Tridigital Triangular Numbers

CROSSREFS

Cf. A000217, A053889, A119110. See A119033 for a table of cross-references.

Sequence in context: A020248 A065827 A143843 this_sequence A144856 A065522 A123213

Adjacent sequences: A119106 A119107 A119108 this_sequence A119110 A119111 A119112

KEYWORD

nonn,base

AUTHOR

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

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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