

A103803


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


5



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
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OFFSET

1,1


LINKS

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


FORMULA

p, 2p15 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*p15) ]; // Vincenzo Librandi, Jan 28 2011


CROSSREFS

Cf. A103802.
Sequence in context: A164861 A040150 A214629 * A188677 A068801 A215504
Adjacent sequences: A103800 A103801 A103802 * A103804 A103805 A103806


KEYWORD

nonn


AUTHOR

Zak Seidov, Feb 16 2005


STATUS

approved



