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 A093013 Numbers n such that 10*n-3 and 10*n+3 are both primes. 4

%I #14 Feb 06 2019 02:19:32

%S 1,2,4,5,7,10,11,16,17,23,26,28,31,35,37,46,56,59,61,65,68,73,86,88,

%T 95,98,109,110,112,119,122,128,130,137,143,145,149,161,166,175,178,

%U 187,191,199,200,214,221,224,227,229,238,242,247,266,268,269,271,280,284,290

%N Numbers n such that 10*n-3 and 10*n+3 are both primes.

%C Contains all terms of A093014.

%H G. C. Greubel, <a href="/A093013/b093013.txt">Table of n, a(n) for n = 1..5000</a>

%F a(n) = A091992(n)/2.

%t Select[Range[600], PrimeQ[10*#-3] && PrimeQ[10*#+3] &] (* _G. C. Greubel_, Feb 05 2019 *)

%o (PARI) for(n=1,290,if(isprime(10*n-3)&&isprime(10*n+3),print1(n,", "))) \\ _Jinyuan Wang_, Feb 06 2019

%Y Cf. A091992, A093014.

%K nonn

%O 1,2

%A _Ray Chandler_, Mar 19 2004

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Last modified June 23 07:33 EDT 2024. Contains 373629 sequences. (Running on oeis4.)