A153767 -id:A153767 - cp's OEIS frontend

A153766 Numbers n such that 8n-9 is prime.

2, 4, 5, 7, 10, 11, 14, 17, 20, 22, 25, 26, 29, 31, 34, 35, 40, 46, 47, 49, 55, 56, 59, 61, 62, 64, 76, 77, 80, 82, 91, 92, 94, 95, 104, 106, 109, 112, 115, 116, 122, 124, 125, 130, 131, 134, 137, 139, 145, 154, 155, 161, 164, 166, 167, 172, 176, 179, 181, 182, 185, 187

Offset: 1

Vincenzo Librandi, Jan 01 2009

One more than the associated value in A005122. - R. J. Mathar, Jan 05 2011

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

Cf. A005122, A153767.

[n: n in [0..200]| IsPrime(8*n-9)]; // Vincenzo Librandi, Dec 28 2013

A153766:=n->if isprime(8*n-9) then n fi; seq(A153766(n), n=1..200); # Wesley Ivan Hurt, Dec 28 2013

Select[Range[200], PrimeQ[8 # - 9] &] (* Harvey P. Dale, Oct 21 2011 *)

is(n)=isprime(8*n-9) \\ Charles R Greathouse IV, Feb 20 2017

83 replaced by 82 from R. J. Mathar, Jan 07 2009

A153768 Numbers n such that n, 8n-9 and 8n+9 are primes.

Original entry on oeis.org

11, 29, 31, 109, 199, 251, 269, 379, 419, 521, 599, 601, 661, 881, 991, 1091, 1231, 1289, 1789, 1831, 1861, 1901, 1949, 2239, 2689, 2969, 3181, 3251, 3301, 3359, 3499, 3779, 3821, 4099, 4201, 4339, 4561, 4651, 4679, 4789, 4871, 5281, 5471, 5641, 5659

Offset: 1

Vincenzo Librandi, Jan 01 2009

			For n=11, even 8n-9=79 and 8n+9=97 are primes, therefore 11 is in the sequence.

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

Cf. A153766, A153767, A153762.

[p: p in PrimesUpTo(6000) | IsPrime(8*p-9) and IsPrime(8*p+9)]; // Vincenzo Librandi, Apr 05 2013

lst={}; Do[p=Prime[n]; If[PrimeQ[8*p-9]&&PrimeQ[8*p+9],AppendTo[lst,p]],{n,7!}]; lst (* Vladimir Joseph Stephan Orlovsky, Aug 16 2009 *)
Select[Prime[Range[6000]], PrimeQ[8 # - 9] && PrimeQ[8 # + 9] &] (* Vincenzo Librandi, Apr 05 2013 *)
Select[Prime[Range[800]],AllTrue[8#+{9,-9},PrimeQ]&] (* Harvey P. Dale, Apr 05 2023 *)

241 replaced by 251 and extended by R. J. Mathar, Jan 07 2009

cp's OEIS Frontend

A153766 Numbers n such that 8n-9 is prime.

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