This site is supported by donations to The OEIS Foundation.

 Annual appeal: Please make a donation to keep the OEIS running! Over 6000 articles have referenced us, often saying "we discovered this result with the help of the OEIS". Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.