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A103753 Numbers k such that the string 235711k is prime. 0

%I

%S 9,27,39,43,73,79,109,117,129,187,213,219,241,243,247,253,297,319,327,

%T 331,361,367,369,387,417,433,447,457,471,493,513,523,537,547,577,591,

%U 601,621,633,639,643,661,699,703,709,717,727,757,759

%N Numbers k such that the string 235711k is prime.

%e k=9 is in the sequence because 235711k = 2357119 is a prime number.

%e k=79 is in the sequence because 235711k = 23571179 is a prime number.

%e k=187 is in the sequence because 235711k = 235711187 is a prime number.

%o (MAGMA) [ n: n in [1..1750] | IsPrime(Seqint(Intseq(n) cat [1, 1, 7, 5, 3, 2])) ]; // _Vincenzo Librandi_, Feb 02 2011

%Y Cf. A103630, A103629, A103590, A103540, A099192.

%K base,nonn

%O 1,1

%A _Parthasarathy Nambi_, Mar 28 2005

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Last modified February 26 13:20 EST 2021. Contains 341632 sequences. (Running on oeis4.)