The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A119144 Triangular numbers composed of digits {1,6,9}. 2
1, 6, 66, 91, 666, 961191, 996166, 1191196, 96111966961, 99119996661, 16161696119661, 196999111911966, 661969169911666, 11961669169169616, 19961691661699161, 991961666199161911, 6116119911196616916, 16961161696691611916961, 911666691991111199916696 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
FORMULA
a(n) = A000217(A119145(n)). - Michel Marcus, Mar 24 2023
CROSSREFS
Cf. A000217, A053911, A119145. See A119033 for a table of cross-references.
Sequence in context: A372547 A122780 A153514 * A153087 A117794 A101011
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, May 10 2006
EXTENSIONS
a(18)-a(19) from Tyler Busby, Mar 24 2023
STATUS
approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 16 10:42 EDT 2024. Contains 373425 sequences. (Running on oeis4.)