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

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A119236 Triangular numbers composed of digits {7,8,9}. 2
78, 8778, 887778, 88877778, 8888777778, 777887999778, 888887777778, 7798988788878, 88888877777778, 8888888777777778, 888888887777777778, 88888888877777777778, 8888888888777777777778, 78879897887889899897778 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..14.

G. Resta, Tridigital Triangular Numbers

CROSSREFS

Cf. A000217, A058472, A119237. See A119033 for a table of cross-references.

Sequence in context: A268016 A077694 A119216 * A126998 A299712 A159402

Adjacent sequences:  A119233 A119234 A119235 * A119237 A119238 A119239

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 December 5 00:21 EST 2021. Contains 349530 sequences. (Running on oeis4.)