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A097480 Positive integers n such that 2n-15 is prime.

%I A097480 #26 Feb 04 2024 01:17:49
%S A097480 9,10,11,13,14,16,17,19,22,23,26,28,29,31,34,37,38,41,43,44,47,49,52,
%T A097480 56,58,59,61,62,64,71,73,76,77,82,83,86,89,91,94,97,98,103,104,106,
%U A097480 107,113,119,121,122,124,127,128,133,136,139,142,143,146,148,149,154,161,163
%N A097480 Positive integers n such that 2n-15 is prime.
%H A097480 Shawn A. Broyles, <a href="/A097480/b097480.txt">Table of n, a(n) for n = 1..1000</a>
%F A097480 Half of p+15 where p is a prime greater than 2.
%t A097480 (Prime[Range[2,100]]+15)/2 (* _Vladimir Joseph Stephan Orlovsky_, Feb 08 2010 *)
%t A097480 Select[Range[9,200],PrimeQ[2#-15]&] (* _Harvey P. Dale_, Apr 04 2021 *)
%o A097480 (PARI) is(n)=isprime(2*n-15) \\ _Charles R Greathouse IV_, Jul 12 2016
%Y A097480 Cf. A000040, A098602, A098603.
%Y A097480 Numbers n such that 2n+k is prime: A005097 (k=1), A067076 (k=3), A089038 (k=5), A105760 (k=7), A155722 (k=9), A101448 (k=11), A153081 (k=13), A089559 (k=15), A173059 (k=17), A153143 (k=19).
%Y A097480 Numbers n such that 2n-k is prime: A006254 (k=1), A098090 (k=3), A089253 (k=5), A089192 (k=7), A097069 (k=9), A097338 (k=11), A097363 (k=13), this sequence (k=15), A098605 (k=17), A097932 (k=19).
%K A097480 easy,nonn
%O A097480 1,1
%A A097480 Douglas Winston (douglas.winston(AT)srupc.com), Sep 19 2004