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A254665
Primes prime(n) such that prime(n) + 7*n is also prime.
2
3, 71, 79, 89, 101, 199, 271, 281, 293, 349, 359, 433, 463, 479, 569, 577, 641, 659, 701, 743, 769, 787, 809, 839, 863, 911, 953, 1013, 1033, 1049, 1109, 1181, 1249, 1277, 1321, 1361, 1399, 1429, 1451, 1459, 1481, 1511, 1549, 1571, 1627, 1693, 1733, 1759, 1889
OFFSET
1,1
EXAMPLE
prime(2)=3 is in the sequence because 3+7*2 = 17 is prime.
prime(20)=71 is in the sequence because 71+7*20 = 211 is prime.
MATHEMATICA
Prime[Select[Range[300], PrimeQ[Prime[#] + 7# ]&]]
PROG
(Magma) [NthPrime(n): n in [1..300] | IsPrime(NthPrime(n)+7*n)];
CROSSREFS
KEYWORD
nonn
AUTHOR
Vincenzo Librandi, Feb 04 2015
STATUS
approved