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 A138644 Primes p such that 5*p+2 is composite. 1

%I

%S 2,5,11,17,23,29,37,41,43,47,53,59,71,83,89,101,103,107,113,127,131,

%T 137,139,149,163,167,173,179,191,197,211,227,229,233,239,241,251,257,

%U 263,269,271,277,281,283,293,307,311,317,337,347,353,359,367,379,383,389

%N Primes p such that 5*p+2 is composite.

%H Harvey P. Dale, <a href="/A138644/b138644.txt">Table of n, a(n) for n = 1..2500</a>

%e 5*2+2=12, 5*5+2=27, 5*11+2=57,...

%t a={};Do[p=Prime[n];If[ !PrimeQ[5*p+2],AppendTo[a,p]],{n,8^2}];a

%t Select[Prime[Range[100]],!PrimeQ[5#+2]&] (* _Harvey P. Dale_, Nov 07 2013 *)

%K nonn

%O 1,1

%A _Vladimir Joseph Stephan Orlovsky_, May 15 2008

%E More terms from _Vincenzo Librandi_, Apr 01 2010

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Last modified November 29 04:38 EST 2021. Contains 349416 sequences. (Running on oeis4.)