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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A119173 Numbers n such that the n-th triangular number contains only digits {2,6,7}. 2
3, 11, 23, 36, 123, 3651, 394123, 2307651, 74534188, 394392348, 3639430251, 1159885996348 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Next entry must be greater than 4.4*10^18.

LINKS

Table of n, a(n) for n=1..12.

G. Resta, Tridigital Triangular Numbers

CROSSREFS

Cf. A000217, A119172. See A119034 for a table of cross-references.

Sequence in context: A094379 A072671 A320901 * A106201 A132209 A142463

Adjacent sequences:  A119170 A119171 A119172 * A119174 A119175 A119176

KEYWORD

nonn,base,more

AUTHOR

Giovanni Resta, May 10 2006

EXTENSIONS

Lower bound for further terms updated by Max Alekseyev, May 07 2009

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 24 09:37 EDT 2019. Contains 324323 sequences. (Running on oeis4.)