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!)
A104946 Primes from merging of 3 successive digits in decimal expansion of the Champernowne Constant. 1

%I #18 Apr 30 2013 03:16:30

%S 101,131,151,617,181,223,829,293,313,233,353,373,383,839,647,859,263,

%T 727,757,677,787,283,919,929,293,991,101,103,107,109,911,101,211,113,

%U 131,311,151,181,811,191,211,241,251,127,271,281,131,311,113,331,313

%N Primes from merging of 3 successive digits in decimal expansion of the Champernowne Constant.

%H Vincenzo Librandi, <a href="/A104946/b104946.txt">Table of n, a(n) for n = 1..1000</a>

%H The first <a href="http://www.worldwideschool.org/library/books/sci/math/MiscellaneousMathematicalConstants/chap12.html">2,800 digits of the Champernowne Constant</a> as calculated at WorldWideSchool.org.

%t Select[Select[FromDigits/@Partition[Flatten[IntegerDigits/@Range[200]], 3, 1], PrimeQ], IntegerLength[#] == 3&] (* _Vincenzo Librandi_, Apr 24 2013 *)

%Y Cf. A033307.

%K nonn,base

%O 1,1

%A Andrew G. West (WestA(AT)wlu.edu), Mar 29 2005

%E Changed offset from 0 to 1 by _Vincenzo Librandi_, Apr 24 2013

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 April 25 13:02 EDT 2024. Contains 371969 sequences. (Running on oeis4.)