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A153432 Numbers m such that all ten numbers 10^k*m+1; k=0,1,...,9 are prime. 2

%I #2 Mar 30 2012 17:37:48

%S 15538734736,28034367522,41221375552,89468493268,92220460962,

%T 95951017078,105627706800,108012908976,147689513538,161055865908,

%U 177073756566,181921823202,185137153012,192336309046,212463686778

%N Numbers m such that all ten numbers 10^k*m+1; k=0,1,...,9 are prime.

%C If m & n are in the sequence, k<10 and r=m*n*10^k -1 is prime then r has

%C at least k+1 representations of the form p*q-(p+q)where p & q are prime.

%H Carlos Rivera, <a href="http://www.primepuzzles.net/puzzles/puzz_482.htm">Two Bergot questions</a>

%Y Cf. A153431, A153433.

%K nonn

%O 1,1

%A _Farideh Firoozbakht_, Mar 31 2009

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Last modified April 25 07:53 EDT 2024. Contains 371964 sequences. (Running on oeis4.)