A156288 -id:A156288 - cp's OEIS frontend

A156287 Numbers k such that 4*k-5 is a prime number.

2, 3, 4, 6, 7, 9, 12, 13, 16, 18, 19, 21, 22, 27, 28, 33, 34, 36, 39, 42, 43, 46, 49, 51, 54, 57, 58, 61, 64, 67, 69, 72, 78, 79, 84, 88, 91, 93, 96, 97, 106, 109, 111, 112, 117, 118, 121, 123, 124, 126, 127, 132, 138, 142, 144, 148, 151, 153, 156, 159, 162, 163, 166

Offset: 1

Vincenzo Librandi, Feb 07 2009

Two more than the associated A095278, one more than the associated A005099. - R. J. Mathar, Jan 05 2011

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

Cf. A156288, A005099, A095278.

[n: n in [1..400] | IsPrime(4*n - 5)]; // Vincenzo Librandi, Feb 16 2013

Select[Range[600], PrimeQ[4 # - 5]&] (* Vincenzo Librandi, Feb 16 2013 *)

A156300 Primes p such that 4*p - 5 is also prime.

Original entry on oeis.org

2, 3, 7, 13, 19, 43, 61, 67, 79, 97, 109, 127, 151, 163, 181, 211, 223, 229, 277, 307, 331, 373, 379, 397, 457, 463, 523, 601, 607, 613, 673, 727, 733, 751, 757, 853, 883, 907, 919, 967, 1021, 1033, 1069, 1117, 1171, 1201, 1231, 1237, 1321, 1327, 1381, 1399

Offset: 1

Vincenzo Librandi, Feb 07 2009

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

Cf. A156287, A156288.

[p: p in PrimesUpTo(1400) | IsPrime(4*p - 5)]; // Vincenzo Librandi, Oct 31 2012

Select[Prime[Range[1400]], PrimeQ[(4# - 5)]&] (* Vincenzo Librandi, Oct 31 2012 *)

cp's OEIS Frontend

A156287 Numbers k such that 4*k-5 is a prime number.

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