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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A092900 A Jacobsthal sequence (A078008) to base 4. 0
1, 0, 2, 2, 12, 22, 112, 222, 1112, 2222, 11112, 22222, 111112, 222222, 1111112, 2222222, 11111112, 22222222, 111111112, 222222222, 1111111112, 2222222222, 11111111112, 22222222222, 111111111112, 222222222222, 1111111111112 (list; graph; refs; listen; history; internal format)
OFFSET

0,3

FORMULA

For n > 0, a(2n+1) is represented as a string of n 2's and a(2n) as a string of (n-1) 1's followed by a 2.

EXAMPLE

a(8)= 1112 because A078008(8)= 86 (in base 10) = 64 + 16 + 4 + 2 = 1*(4^3)+1*

(4^2)+1*(4^1)+2.

CROSSREFS

Cf. A081857.

Sequence in context: A202669 A178845 A140431 * A164961 A122007 A137782

Adjacent sequences:  A092897 A092898 A092899 * A092901 A092902 A092903

KEYWORD

easy,nonn

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Mar 12 2004

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 14 14:07 EST 2012. Contains 205623 sequences.