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A156300
Primes p such that 4*p - 5 is also prime.
3
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
1,1
LINKS
MATHEMATICA
Select[Prime[Range[1400]], PrimeQ[(4# - 5)]&] (* Vincenzo Librandi, Oct 31 2012 *)
PROG
(Magma) [p: p in PrimesUpTo(1400) | IsPrime(4*p - 5)]; // Vincenzo Librandi, Oct 31 2012
CROSSREFS
Sequence in context: A019383 A249749 A171817 * A067834 A070754 A325875
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Feb 07 2009
STATUS
approved