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A162141
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Primes p such that (p+3839)/3840 is also a prime number.
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0
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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; internal format)
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OFFSET
| 1,1
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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.
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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]
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CROSSREFS
| Sequence in context: A008774 A076339 A105132 * A133859 A012082 A184026
Adjacent sequences: A162138 A162139 A162140 * A162142 A162143 A162144
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KEYWORD
| nonn,less
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AUTHOR
| Vladimir Orlovsky (4vladimir(AT)gmail.com), Jun 25 2009
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EXTENSIONS
| Definition simplified by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 23 2009
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