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

1,2

LINKS

Table of n, a(n) for n=1..16.

G. Resta, Tridigital Triangular Numbers

CROSSREFS

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

Sequence in context: A318036 A326164 A143843 * A254603 A144856 A065522

Adjacent sequences:  A119106 A119107 A119108 * A119110 A119111 A119112

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, May 10 2006

STATUS

approved

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Last modified August 7 23:56 EDT 2020. Contains 336280 sequences. (Running on oeis4.)