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A103805 Primes p such that 2*p-27 and 2*p+27 are positive primes. 3
17, 23, 37, 43, 83, 103, 127, 197, 257, 307, 313, 317, 337, 373, 457, 673, 677, 727, 733, 797, 863, 887, 937, 953, 1013, 1063, 1283, 1303, 1597, 1667, 1693, 1777, 1783, 1987, 1997, 2053, 2063, 2267, 2297, 2393, 2473, 2543, 2707, 2777, 2833, 2837 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

MATHEMATICA

Select[Range[17, 2000], PrimeQ[ # ] && PrimeQ[2# + 27] && PrimeQ[2# - 27] &]

Select[Prime[Range[5, 500]], And@@PrimeQ[2#+{27, -27}]&] (* Harvey P. Dale, Jul 06 2013 *)

PROG

(MAGMA) [p: p in PrimesUpTo(3000) | IsPrime(2*p-27) and IsPrime(2*p+27)]; [From Vincenzo Librandi, Nov 16 2010]

CROSSREFS

Cf. A103802, A103803, A103804.

Sequence in context: A072184 A107644 A158710 * A241528 A156567 A231332

Adjacent sequences:  A103802 A103803 A103804 * A103806 A103807 A103808

KEYWORD

nonn

AUTHOR

Zak Seidov, Feb 16 2005

EXTENSIONS

More terms from Vincenzo Librandi, Mar 17 2010

STATUS

approved

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Last modified August 21 13:36 EDT 2017. Contains 290890 sequences.