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A119106 Numbers n such that the n-th triangular number contains only digits {1,2,7}. +0
3
1, 6, 18, 58, 66, 381, 493, 666, 1193, 6666, 12018, 66666, 156058, 379941, 585281, 666666, 6666666, 15603058, 66666666, 210319381, 666666666, 4933998806, 6666666666, 66666666666, 185864319933, 666666666666, 6666666666666 (list; graph; listen)
OFFSET

1,2

LINKS

G. Resta, Tridigital Triangular Numbers

CROSSREFS

Cf. A000217, A119105. See A119034 for a table of cross-references.

Sequence in context: A035070 A075386 A056343 this_sequence A144706 A074427 A034751

Adjacent sequences: A119103 A119104 A119105 this_sequence A119107 A119108 A119109

KEYWORD

nonn,base

AUTHOR

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

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Last modified December 7 08:40 EST 2009. Contains 170430 sequences.


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