The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A075750 210*n -/+ 11 are primes. 1
 2, 3, 5, 7, 9, 10, 13, 17, 26, 29, 34, 45, 48, 54, 57, 59, 60, 61, 63, 75, 82, 89, 108, 112, 113, 123, 133, 136, 139, 140, 146, 147, 148, 150, 151, 153, 156, 166, 167, 172, 173, 174, 175, 177, 184, 185, 195, 208, 210, 215, 227, 245, 250, 265, 266, 269, 278, 279 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 EXAMPLE n=2: 210*2-11=409 and 210*2+11=431 are primes. MATHEMATICA Select[Range[1, 300], PrimeQ[210 # - 11]&&PrimeQ[210 # + 11] &] (* Vincenzo Librandi, Oct 05 2013 *) PROG (PARI) isok(n) = isprime(210*n+11) && isprime(210*n-11); \\ Michel Marcus, Oct 03 2013 (MAGMA) [n: n in [1..350] | IsPrime(210*n-11) and IsPrime(210*n+11)]; // Vincenzo Librandi, Oct 05 2013 CROSSREFS Sequence in context: A044918 A103635 A133677 * A331232 A219050 A036049 Adjacent sequences:  A075747 A075748 A075749 * A075751 A075752 A075753 KEYWORD easy,nonn AUTHOR Zak Seidov, Oct 08 2002 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
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified August 9 04:21 EDT 2020. Contains 336319 sequences. (Running on oeis4.)