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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..49.

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

Cf. A061067, A231232, A231383, A254462.

Sequence in context: A093245 A108231 A130894 * A106894 A166449 A094458

Adjacent sequences:  A254662 A254663 A254664 * A254666 A254667 A254668

KEYWORD

nonn

AUTHOR

Vincenzo Librandi, Feb 04 2015

STATUS

approved

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Last modified April 16 11:10 EDT 2021. Contains 343037 sequences. (Running on oeis4.)