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A064968 Numbers k such that 1000000000k+1, 1000000000k+3, 1000000000k+7, 1000000000k+9 are all primes. 1

%I

%S 14965,16813,20767,23083,34270,40198,93238,112096,189802,192484,

%T 251248,333946,334969,363514,374107,375127,376765,383473,405046,

%U 419458,462928,498139,649948,703246,704374,732463,767101,781885,806467,812902,842428

%N Numbers k such that 1000000000k+1, 1000000000k+3, 1000000000k+7, 1000000000k+9 are all primes.

%H Harry J. Smith, <a href="/A064968/b064968.txt">Table of n, a(n) for n = 1..1000</a>

%t Select[Range[10^6], PrimeQ[10^9# + 1] && PrimeQ[10^9# + 3] && PrimeQ[10^9# + 7] && PrimeQ[10^9# + 9] &]

%o (PARI) { n=0; for (m=1, 10^9, b=10^9*m; if(isprime(b + 1) && isprime(b + 3) && isprime(b + 7) && isprime(b + 9), write("b064968.txt", n++, " ", m); if (n==1000, return)) ) } \\ _Harry J. Smith_, Oct 01 2009

%Y Cf. A007811, A064687.

%K nonn

%O 1,1

%A _Robert G. Wilson v_, Oct 29 2001

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Last modified September 22 01:18 EDT 2021. Contains 347605 sequences. (Running on oeis4.)