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A178589 Smallest prime that is the average of the members of exactly n emirp pairs. 2

%I

%S 11311,14741,24547,25447,1427291,2278277,1551551,2403487,2477297,

%T 2402537,2512597,123085271,2509597,124333421,123974371,133504831,

%U 132954781,135166981,136545131,134525431,135955081,135004981,145475041

%N Smallest prime that is the average of the members of exactly n emirp pairs.

%e a(3) = 24547 is the first prime arithmetic mean of 3 emirp pairs, viz., (11083, 38011), (12073, 37021), (18013, 31081), followed by prime 27067, equidistant between members of each of the 3 emirp pairs (14593, 39541), (16573, 37561), (19543, 34591), and continues on with prime 42929, the average of exactly 3 other emirp pairs (10457, 75401), (11447, 74411), (12437, 73421), ...

%Y Cf. A178581, A178587, A178588.

%K nonn,base

%O 1,1

%A _Lekraj Beedassy_, May 29 2010

%E Extended by _Ray Chandler_, Jul 05 2010

%E a(5)-a(23) from _Donovan Johnson_, Jul 06 2010

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Last modified December 6 15:25 EST 2016. Contains 278781 sequences.