A103803 Primes p such that both 2p - 15 and 2p + 15 are primes.

11, 13, 19, 23, 29, 37, 41, 43, 47, 61, 71, 83, 89, 107, 113, 127, 139, 149, 191, 197, 223, 281, 293, 331, 379, 419, 421, 461, 463, 491, 499, 503, 523, 569, 593, 601, 653, 719, 733, 769, 797, 811, 821, 839, 881, 887, 1049, 1063, 1129, 1163, 1181, 1213, 1231

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Formula

p, 2p-15 and 2p+15 all are positive and are primes (hence we omit p=2).

Mathematica

Select[Range[11, 2000], PrimeQ[ # ] && PrimeQ[2# + 15] && PrimeQ[2# - 15] &]
Select[Prime[Range[2, 250]], And@@PrimeQ[2#+{15, -15}]&] (* Harvey P. Dale, May 21 2013 *)

Prog

(Magma) [p: p in PrimesUpTo(3200)| IsPrime(2*p+15) and IsPrime(2*p-15) ]; // Vincenzo Librandi, Jan 28 2011

Crossrefs

Cf. A103802.

Sequence in context: A040150 A214629 A330696 * A188677 A068801 A215504

Adjacent sequences: A103800 A103801 A103802 * A103804 A103805 A103806

Keyword

nonn

Author

Zak Seidov, Feb 16 2005

Status

approved