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

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A119192 Triangular numbers composed of digits {3,5,9}. 2
3, 55, 595, 5995, 33533955, 5939355555, 9993335593335, 535555935535935, 599593353353393939939955, 595993553593935939553359535599399555 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..10.

G. Resta, Tridigital Triangular Numbers

FORMULA

a(n) = A000217(A119193(n))

CROSSREFS

Cf. A000217, A119193. See A119033 for a table of cross-references.

Sequence in context: A119061 A197094 A156379 * A103134 A235534 A300992

Adjacent sequences:  A119189 A119190 A119191 * A119193 A119194 A119195

KEYWORD

nonn,base,more

AUTHOR

Giovanni Resta, May 10 2006

EXTENSIONS

a(10) from Max Alekseyev, May 21 2011

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 8 18:37 EST 2019. Contains 329865 sequences. (Running on oeis4.)