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A119099 Triangular numbers composed of digits {1,2,4}. 2
1, 21, 2211, 222111, 1422141, 4244241, 22221111, 44241121, 124212441, 2222211111, 222222111111, 22222221111111, 1111114242224421, 2222222211111111, 21414424114444221, 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, A053881, A119100. See A119033 for a table of cross-references.

Sequence in context: A007593 A219104 A219983 * A215160 A219000 A033510

Adjacent sequences:  A119096 A119097 A119098 * A119100 A119101 A119102

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, May 10 2006

STATUS

approved

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Last modified June 19 11:36 EDT 2013. Contains 226404 sequences.