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A164622 Primes p such that p*floor(p/2) - 4 and p*floor(p/2) + 4 are prime numbers. 1
151, 463, 571, 631, 643, 991, 1063, 1171, 1831, 2083, 2311, 4951, 5023, 6211, 6703, 6763, 7723, 7951, 9043, 11383, 12163, 12391, 13183, 14851, 15031, 17431, 19231, 19543, 20143, 22051, 23143, 25951, 26371, 27283, 28351, 29131, 30643, 32803 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
151*75-4=11321 (prime), 151*75+4=11329 (prime), ..
LINKS
MATHEMATICA
lst={}; Do[p=Prime[n]; If[PrimeQ[p*Floor[p/2]-4]&&PrimeQ[p*Floor[p/2]+4], AppendTo[lst, p]], {n, 8!}]; lst
CROSSREFS
Sequence in context: A002226 A142361 A142506 * A176138 A139640 A334836
KEYWORD
nonn
AUTHOR
EXTENSIONS
Edited by Charles R Greathouse IV, Nov 02 2009
STATUS
approved

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)