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A138657 Primes p such that 48*p - 1 and 48*p + 1 are twin primes. 3

%I #8 Dec 29 2019 08:39:45

%S 5,31,89,109,271,331,571,599,661,709,719,761,859,1109,1171,1319,1489,

%T 1619,1699,1811,2399,2971,3041,3119,3329,3449,3659,4211,4421,4861,

%U 5051,5309,5441,6011,6379,6491,6571,6661,7039

%N Primes p such that 48*p - 1 and 48*p + 1 are twin primes.

%H Amiram Eldar, <a href="/A138657/b138657.txt">Table of n, a(n) for n = 1..10000</a>

%e 5 is a term since it is a prime and 48*5 - 1 = 239 and 48*5 + 1 = 241 are twin primes.

%e 31 is a term since it is a prime and 48*31 - 1 = 1487 and 48*31 + 1 = 1489 are twin primes.

%t a=48;Select[Prime[Range[10^3]],PrimeQ[a*#-1]&&PrimeQ[a*#+1]&]

%Y Cf. A001097, A001359, A006512.

%Y Cf. A138656, A138658, A138659.

%K nonn

%O 1,1

%A _Vladimir Joseph Stephan Orlovsky_, May 15 2008

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Last modified September 4 20:04 EDT 2024. Contains 375685 sequences. (Running on oeis4.)