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A117097 Numbers n such that nextprime(3*n)<3*nextprime(n) (if p is prime then nextprime(p)=p). 1

%I #5 Nov 23 2017 19:46:14

%S 1,4,6,8,9,10,12,14,15,20,21,22,24,25,26,27,32,33,34,35,36,42,44,45,

%T 46,48,49,50,51,52,54,55,56,57,60,62,63,64,65,66,68,69,70,74,75,76,77,

%U 80,84,85,86,87,90,91,92,93,94,102,104,105,110,111,112,114,115,116,117,118

%N Numbers n such that nextprime(3*n)<3*nextprime(n) (if p is prime then nextprime(p)=p).

%H Iain Fox, <a href="/A117097/b117097.txt">Table of n, a(n) for n = 1..10000</a>

%e nextprime(3*4)=13 and nextprime(3)*nextprime(4)=3*5=15 then 4 is member because 13<15

%o (PARI) for(i=1,150,if(nextprime(3*i)<nextprime(3)*nextprime(i),print1(i,",")))

%K easy,nonn

%O 1,2

%A Mohammed Bouayoun (mohammed.bouayoun(AT)sanef.com), Apr 18 2006

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Last modified March 28 09:04 EDT 2024. Contains 371240 sequences. (Running on oeis4.)