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!)
A068889 Triangular numbers with property that digits alternate in parity individually as well as in concatenation with previous terms. 0
1, 6, 10, 36, 78, 105, 210, 325, 496, 561, 630, 703, 2145, 5050, 6105, 8385, 23653, 30381, 41616, 50721, 67896, 70125, 81810, 90525, 210925, 214185 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..26.

CROSSREFS

Cf. A068882.

Sequence in context: A032740 A167330 A025629 * A203485 A221519 A332984

Adjacent sequences:  A068886 A068887 A068888 * A068890 A068891 A068892

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Mar 20 2002

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 September 26 05:00 EDT 2020. Contains 337346 sequences. (Running on oeis4.)