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A130735 Primes p such that p+2, n*(p+2)+6 and p*(p+2)+8 are also prime. 1
5, 11, 2591, 4127, 10427, 11831, 15887, 28547, 56921, 60257, 61331, 62927, 65717, 70487, 74411, 77417, 77687, 81281, 87221, 100391, 104087, 115301, 116687, 121367, 124181, 129287, 148691, 149111, 158141, 173741, 199151, 208961 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

MAPLE

a:=proc(n) local p: p:=ithprime(n): if isprime(p+2)=true and isprime(p*(p+2)+6) =true and isprime(p*(p+2)+8)=true then p else end if end proc: seq(a(n), n= 1 .. 20000); # Emeric Deutsch, Jul 25 2007

MATHEMATICA

apQ[n_]:=Module[{n2=n(n+2)}, And@@PrimeQ[{n+2, n2+6, n2+8}]]; Select[Prime[Range[ 20000]], apQ] (* Harvey P. Dale, Apr 07 2013 *)

CROSSREFS

Sequence in context: A174957 A174955 A224095 * A322153 A022835 A022834

Adjacent sequences: A130732 A130733 A130734 * A130736 A130737 A130738

KEYWORD

nonn

AUTHOR

Ray G. Opao, Jul 06 2007

EXTENSIONS

More terms from Emeric Deutsch, Jul 25 2007

STATUS

approved

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Last modified November 26 17:30 EST 2022. Contains 358362 sequences. (Running on oeis4.)