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A162141 Primes p such that (p+3839)/3840 is also a prime number. 0

%I

%S 7681,15361,23041,61441,84481,115201,138241,161281,176641,299521,

%T 384001,414721,430081,576001,729601,737281,760321,875521,890881,

%U 913921,921601,1075201,1082881,1198081,1374721,1451521,1651201,1720321,1751041

%N Primes p such that (p+3839)/3840 is also a prime number.

%C Primes p such that (((((((((p+1)/2)+3)/4)+5)/6)+7)/8)+9)/10 are prime numbers.

%C There is no requirement of the intermediate numbers on the level ((((((((p+1)/2)+3)/4)+5)/6)+7)/8)+9

%C to be prime or composite.

%t lst={};Do[p=Prime[n];If[PrimeQ[(((((((((p+1)/2)+3)/4)+5)/6)+7)/8)+9)/10], AppendTo[lst,p]],{n,9!}]; lst

%t Select[Prime[Range[200000]],PrimeQ[(#+3839)/3840]&] [by Harvey P. Dale, Dec. 13, 2010]

%K nonn,less

%O 1,1

%A _Vladimir Joseph Stephan Orlovsky_, Jun 25 2009

%E Definition simplified by _R. J. Mathar_, Sep 23 2009

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Last modified July 20 01:17 EDT 2019. Contains 325168 sequences. (Running on oeis4.)