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A025584
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Primes p such that p-2 is not a prime.
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19
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2, 3, 11, 17, 23, 29, 37, 41, 47, 53, 59, 67, 71, 79, 83, 89, 97, 101, 107, 113, 127, 131, 137, 149, 157, 163, 167, 173, 179, 191, 197, 211, 223, 227, 233, 239, 251, 257, 263, 269, 277, 281, 293, 307, 311, 317, 331, 337, 347, 353, 359, 367, 373, 379, 383, 389, 397, 401
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OFFSET
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1,1
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COMMENTS
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Primes p (for p>=11) such that sigma(p-2) > p. - Benoit Cloitre, Feb 08 2002
Prime numbers that are not the sum of two smaller prime numbers. - Tomas Xordan, May 10 2007
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 1..10000
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FORMULA
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a(n) ~ n log n. - Charles R Greathouse IV, Jan 10 2013
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MATHEMATICA
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Select[ Prime /@ Range[100], ! PrimeQ[# - 2] &] (* Jean-François Alcover, Apr 19 2013 *)
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PROG
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(MAGMA) [p: p in PrimesUpTo(420) | not IsPrime(p-2)]; // Vincenzo Librandi, Jul 26 2013
(PARI) lista(nn) = forprime(p=2, nn, if (!isprime(p-2), print1(p, ", ")); ); \\ Michel Marcus, Dec 05 2015
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CROSSREFS
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Complement of A006512 in A000040.
Cf. A014092.
Sequence in context: A100962 A045337 A098700 * A242256 A189483 A164952
Adjacent sequences: A025581 A025582 A025583 * A025585 A025586 A025587
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane.
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EXTENSIONS
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Better description from Vladeta Jovovic, Dec 14 2002
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STATUS
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approved
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