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A156012 Primes p such that 2*p+3 and 32*p+93 are both prime. 1

%I #9 Sep 08 2022 08:45:41

%S 2,7,13,19,29,47,53,67,113,127,167,193,197,223,349,503,509,523,547,

%T 613,739,743,809,827,859,887,1033,1069,1117,1327,1373,1427,1429,1453,

%U 1553,1607,1609,1663,1693,1723,1777,1847,2063,2087,2099,2113,2143,2203,2239

%N Primes p such that 2*p+3 and 32*p+93 are both prime.

%H Vincenzo Librandi, <a href="/A156012/b156012.txt">Table of n, a(n) for n = 1..1000</a>

%p a := proc (n) if isprime(2*ithprime(n)+3) = true and isprime(32*ithprime(n)+93) = true then ithprime(n) else end if end proc: seq(a(n), n = 1 .. 450); # _Emeric Deutsch_, Mar 01 2009

%t Select[Prime[Range[2500]], And @@ PrimeQ[{2# + 3, 32# + 93}]&] (* _Vincenzo Librandi_, Oct 30 2012 *)

%o (Magma) [p: p in PrimesUpTo(2500)| IsPrime(2*p + 3) and IsPrime(32*p + 93)]; // _Vincenzo Librandi_, Oct 30 2012

%Y Cf. A156007.

%K nonn,easy

%O 1,1

%A _Vincenzo Librandi_, Feb 01 2009

%E More terms from _Emeric Deutsch_, Mar 01 2009

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Last modified July 20 17:18 EDT 2024. Contains 374459 sequences. (Running on oeis4.)