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A075752 210*n -/+ 17 ares both primes. 1
1, 3, 4, 7, 8, 9, 22, 26, 32, 42, 45, 46, 52, 56, 57, 58, 62, 70, 75, 79, 81, 84, 86, 87, 96, 99, 100, 101, 103, 111, 129, 139, 142, 143, 146, 166, 178, 179, 185, 191, 196, 200, 201, 202, 216, 217, 234, 235, 240, 241, 252, 253, 260, 265, 267, 276, 294, 295, 298 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

EXAMPLE

n=1: 210*1-17=193 and 210*1+17=227 are primes.

MATHEMATICA

Select[Range[1, 300], PrimeQ[210 # - 17]&&PrimeQ[210 # + 17]&] (* Vincenzo Librandi, Oct 05 2013 *)

PROG

(PARI) isok(n) = isprime(210*n+17) && isprime(210*n-17); \\ Michel Marcus, Oct 03 2013

(MAGMA) [n: n in [1..350] | IsPrime(210*n-17) and IsPrime(210*n+17)]; // Vincenzo Librandi, Oct 05 2013

CROSSREFS

Sequence in context: A004201 A109054 A129142 * A046541 A219897 A047344

Adjacent sequences:  A075749 A075750 A075751 * A075753 A075754 A075755

KEYWORD

easy,nonn

AUTHOR

Zak Seidov, Oct 08 2002

STATUS

approved

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Last modified February 15 22:28 EST 2019. Contains 320138 sequences. (Running on oeis4.)