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A023220
Primes p such that 5*p + 8 is also prime.
6
3, 7, 13, 19, 31, 37, 43, 61, 73, 103, 127, 163, 211, 223, 229, 241, 283, 307, 331, 337, 349, 373, 397, 409, 421, 439, 457, 499, 541, 631, 661, 673, 691, 727, 733, 757, 769, 787, 829, 853, 883, 919, 997, 1021, 1063, 1087, 1123, 1129, 1213, 1231, 1447, 1543, 1549
OFFSET
1,1
COMMENTS
Except for the first term all others are congruent to 1 (mod 6) because 5*(6*n+5)+8 is divisible by 3. - Zak Seidov, Aug 23 2012
MATHEMATICA
Select[Prime[Range[250]], PrimeQ[5#+8]&] (* Harvey P. Dale, Apr 21 2020 *)
PROG
(Magma) [n: n in [0..1000] | IsPrime(n) and IsPrime(5*n+8)]; // Vincenzo Librandi, Nov 20 2010
CROSSREFS
Cf. A002476, A111225 (supersequence).
Sequence in context: A015916 A023203 A086135 * A207990 A023205 A304874
KEYWORD
nonn
STATUS
approved