A254673 Primes prime(n) such that prime(n) + 4*n is also prime.

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

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 * A343976 A155916 A038979

Adjacent sequences: A254670 A254671 A254672 * A254674 A254675 A254676

Keyword

nonn

Author

Vincenzo Librandi, Feb 05 2015

Status

approved