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 A162141 Primes p such that (p+3839)/3840 is also a prime number. 0
 7681, 15361, 23041, 61441, 84481, 115201, 138241, 161281, 176641, 299521, 384001, 414721, 430081, 576001, 729601, 737281, 760321, 875521, 890881, 913921, 921601, 1075201, 1082881, 1198081, 1374721, 1451521, 1651201, 1720321, 1751041 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Primes p such that (((((((((p+1)/2)+3)/4)+5)/6)+7)/8)+9)/10 are prime numbers. There is no requirement of the intermediate numbers on the level ((((((((p+1)/2)+3)/4)+5)/6)+7)/8)+9 to be prime or composite. LINKS Table of n, a(n) for n=1..29. MATHEMATICA lst={}; Do[p=Prime[n]; If[PrimeQ[(((((((((p+1)/2)+3)/4)+5)/6)+7)/8)+9)/10], AppendTo[lst, p]], {n, 9!}]; lst Select[Prime[Range[200000]], PrimeQ[(#+3839)/3840]&] [by Harvey P. Dale, Dec. 13, 2010] CROSSREFS Sequence in context: A249219 A076339 A105132 * A133859 A012082 A184026 Adjacent sequences: A162138 A162139 A162140 * A162142 A162143 A162144 KEYWORD nonn,less AUTHOR Vladimir Joseph Stephan Orlovsky, Jun 25 2009 EXTENSIONS Definition simplified by R. J. Mathar, Sep 23 2009 STATUS approved

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Last modified February 25 13:12 EST 2024. Contains 370330 sequences. (Running on oeis4.)