A153245 -id:A153245 - cp's OEIS frontend

A153135 Primes p such that 6*p - 7 is also prime.

2, 3, 5, 11, 13, 19, 23, 29, 31, 41, 43, 53, 59, 61, 71, 73, 79, 83, 101, 109, 139, 149, 163, 173, 193, 199, 211, 229, 239, 241, 251, 263, 269, 271, 313, 331, 349, 353, 379, 401, 409, 431, 433, 449, 491, 503, 521, 563, 569, 613, 631, 643, 653, 659, 683, 691, 733, 743

Offset: 1

Vincenzo Librandi, Dec 21 2008

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

Cf. A153245, A153134. - Vladimir Joseph Stephan Orlovsky, Dec 23 2008

[n: n in [0..900] | IsPrime(n) and IsPrime(6*n - 7)]; // "or" [p: p in PrimesUpTo(900) | IsPrime(6*p - 7)]; // Vincenzo Librandi, Oct 20 2012

lst={};Do[p=Prime[n];If[PrimeQ[6*p-7],AppendTo[lst,p]],{n,6!}];lst (* Vladimir Joseph Stephan Orlovsky, Dec 23 2008 *)
Select[Prime[Range[110]],PrimeQ[6#-7]&] (* Harvey P. Dale, Oct 25 2011 *)

Corrected by D. S. McNeil, Dec 10 2010

A153134 Numbers k such that 6k - 7 is prime.

Original entry on oeis.org

2, 3, 4, 5, 6, 8, 9, 10, 11, 13, 15, 16, 18, 19, 20, 23, 24, 26, 29, 30, 31, 33, 34, 39, 40, 41, 43, 44, 45, 46, 48, 50, 53, 54, 59, 60, 61, 65, 66, 68, 71, 73, 75, 76, 78, 79, 81, 83, 85, 86, 88, 94, 95, 96, 99, 100, 101, 104, 108, 109, 110, 111, 114, 115, 118, 121, 125, 128

Offset: 1

Vincenzo Librandi, Dec 21 2008

One more than the associated term in A024898. - R. J. Mathar, Jan 05 2011

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

Cf. A153245, A153135. - Vladimir Joseph Stephan Orlovsky, Dec 23 2008

[n: n in [1..150] | IsPrime(6*n - 7)]; // Vincenzo Librandi, Sep 24 2012

is(n)=isprime(6*n-7) \\ Charles R Greathouse IV, Feb 20 2017

Corrected and extended by Vladimir Joseph Stephan Orlovsky, Dec 23 2008

A153319 Primes p such that 6*p-7 is not prime.

Original entry on oeis.org

7, 17, 37, 47, 67, 89, 97, 103, 107, 113, 127, 131, 137, 151, 157, 167, 179, 181, 191, 197, 223, 227, 233, 257, 277, 281, 283, 293, 307, 311, 317, 337, 347, 359, 367, 373, 383, 389, 397, 419, 421, 439, 443, 457, 461, 463, 467, 479, 487, 499, 509, 523, 541

Offset: 1

Vladimir Joseph Stephan Orlovsky, Dec 23 2008, Jan 02 2009

nonn

Harvey P. Dale, Table of n, a(n) for n = 1..2000

Cf. A153134, A153135, A153245

lst={};Do[p=Prime[n];If[ !PrimeQ[6*p-7],AppendTo[lst,p]],{n,6!}];lst
Select[Prime[Range[100]],!PrimeQ[6#-7]&] (* Harvey P. Dale, Dec 13 2019 *)

Typo in definition fixed by Zak Seidov, Nov 14 2011

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A153135 Primes p such that 6*p - 7 is also prime.

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A153134 Numbers k such that 6k - 7 is prime.

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A153319 Primes p such that 6*p-7 is not prime.

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