

A104945


Primes from merging of 2 successive digits in decimal expansion of the Champernowne Constant.


2



23, 67, 89, 11, 11, 13, 31, 41, 61, 17, 71, 19, 23, 29, 31, 13, 23, 43, 53, 37, 73, 83, 41, 43, 47, 53, 59, 61, 67, 97, 71, 17, 73, 37, 47, 67, 79, 83, 89, 19, 29, 59, 97, 79, 89, 11, 31, 41, 61, 71, 11, 11, 11, 11, 11, 11, 13, 31, 11, 41, 11, 11, 61, 11, 17, 71, 11, 11, 19
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OFFSET

1,1


COMMENTS

Leading zeroes not permitted, i.e., the terms must be twodigit primes.  Harvey P. Dale, Sep 15 2017


LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000
The first 2,800 digits of the Champernowne Constant as calculated at WorldWideSchool.org.


MATHEMATICA

Select[Select[FromDigits/@Partition[Flatten[IntegerDigits/@Range[200]], 2, 1], PrimeQ], IntegerLength[#] == 2&] (* Vincenzo Librandi, Apr 24 2013 *)
Select[FromDigits/@Partition[RealDigits[ChampernowneNumber[], 10, 400][[1]], 2, 1], IntegerLength[#]==2&&PrimeQ[#]&] (* Harvey P. Dale, Sep 15 2017 *)


CROSSREFS

Cf. A033307.
Sequence in context: A051875 A125872 A228611 * A141849 A125873 A059241
Adjacent sequences: A104942 A104943 A104944 * A104946 A104947 A104948


KEYWORD

nonn,base


AUTHOR

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


EXTENSIONS

Changed offset from 0 to 1 by Vincenzo Librandi, Apr 24 2013


STATUS

approved



