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A225438 Odd numbers such that no permutation of its digits yields a prime. 0

%I #4 May 08 2013 16:24:39

%S 1,9,15,21,25,27,33,39,45,49,51,55,57,63,65,69,75,77,81,85,87,93,99,

%T 105,111,117,123,129,135,141,147,153,155,159,161,165,171,177,183,185,

%U 187,189,195,201,205,207,213,219,221,225,231,237,243,245,247,249

%N Odd numbers such that no permutation of its digits yields a prime.

%C Subset of A067013.

%e 105 is a member since none of 105, 150, 15, 51, 510, 501 is a prime.

%t t={}; Do[If[Length[Select[Table[FromDigits[k], {k,Permutations[IntegerDigits[n]]}],PrimeQ]]==0, AppendTo[t,n]], {n,1,250,2}]; t

%Y Cf. A067013.

%K nonn,base

%O 1,2

%A _Jayanta Basu_, May 08 2013

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Last modified April 25 03:15 EDT 2024. Contains 371964 sequences. (Running on oeis4.)