login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A119106 Numbers n such that the n-th triangular number contains only digits {1,2,7}. 2
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; refs; listen; history; internal format)
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 * A144706 A074427 A034751

Adjacent sequences:  A119103 A119104 A119105 * A119107 A119108 A119109

KEYWORD

nonn,base

AUTHOR

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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 17 07:41 EST 2012. Contains 205998 sequences.