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 A254673 Primes prime(n) such that prime(n) + 4*n is also prime. 2
 3, 5, 7, 11, 13, 23, 47, 59, 71, 73, 79, 97, 103, 113, 127, 137, 181, 199, 251, 263, 271, 281, 293, 331, 359, 367, 397, 419, 433, 443, 449, 457, 463, 487, 503, 523, 541, 571, 607, 613, 617, 631, 653, 709, 719, 751, 761, 773, 829, 839, 877, 881, 953, 967, 971 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 EXAMPLE prime(4)=7 is in the sequence because 7+4*4 = 23 is prime. prime(6)=13 is in the sequence because 13+4*6 = 37 is prime. MATHEMATICA Prime[Select[Range[180], PrimeQ[Prime[#] + 4 #] &]] PROG (MAGMA) [NthPrime(n): n in [1..200] | IsPrime(NthPrime(n)+4*n)] CROSSREFS Cf. A061067, A231232, A231383, A254462, A254665, A254672. Sequence in context: A080114 A088878 A259730 * A155916 A038979 A179739 Adjacent sequences:  A254670 A254671 A254672 * A254674 A254675 A254676 KEYWORD nonn AUTHOR Vincenzo Librandi, Feb 05 2015 STATUS approved

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Last modified April 14 01:49 EDT 2021. Contains 342941 sequences. (Running on oeis4.)