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

 

Logo

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A105357 Rearrangement of positive integers: parity of a[n] is opposite to parity of n-th digit of decimal expansion of Pi (see comments). 2
2, 4, 1, 6, 8, 3, 10, 12, 14, 5, 7, 16, 18, 20, 9, 22, 24, 26, 28, 11, 30, 13, 15, 17, 19, 21, 23, 32, 34, 25, 36, 27, 38, 40, 42, 29, 31, 33, 35, 37, 44, 46, 48, 50, 39, 52, 54, 56, 58, 60, 62, 64, 66, 41, 68, 43, 45, 47, 70, 72, 49, 74, 51, 53, 76, 78, 55, 80, 57, 82, 59, 84 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Take decimal expansion of pi: 3,1,4,1,5,9,2,6,5,... First digit pi(1)=3, hence a(1)=2; pi(2)=1, hence a(2)=4, pi(3)=4, hence a(3)=1, etc.

LINKS

Table of n, a(n) for n=1..72.

CROSSREFS

Cf. A105353 - A105360.

Sequence in context: A249144 A080032 A297121 * A167546 A011369 A110877

Adjacent sequences:  A105354 A105355 A105356 * A105358 A105359 A105360

KEYWORD

nonn,base

AUTHOR

Zak Seidov, Apr 01 2005

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 January 19 19:49 EST 2019. Contains 319309 sequences. (Running on oeis4.)