login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A119145 Numbers n such that the n-th triangular number contains only digits {1,6,9}. 2
1, 3, 11, 13, 36, 1386, 1411, 1543, 438433, 445241, 5685366, 19849388, 36385963, 154671711, 199808366, 1408518133, 3497461911, 184180138433, 1350308625456, 4892835517288, 11505747426366, 118253893522536, 447137831091711 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..23.

G. Resta, Tridigital Triangular Numbers

CROSSREFS

Cf. A000217, A119144. See A119034 for a table of cross-references.

Sequence in context: A020451 A018450 A302304 * A168454 A181086 A274343

Adjacent sequences:  A119142 A119143 A119144 * A119146 A119147 A119148

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, May 10 2006

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 January 26 11:03 EST 2020. Contains 331279 sequences. (Running on oeis4.)