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

11311, 14741, 24547, 25447, 1427291, 2278277, 1551551, 2403487, 2477297, 2402537, 2512597, 123085271, 2509597, 124333421, 123974371, 133504831, 132954781, 135166981, 136545131, 134525431, 135955081, 135004981, 145475041

Offset

1,1

Links

Table of n, a(n) for n=1..23.

Example

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), ...

Crossrefs

Cf. A178581, A178587, A178588.

Sequence in context: A228627 A178581 A178583 * A266181 A179917 A287245

Adjacent sequences: A178586 A178587 A178588 * A178590 A178591 A178592

Keyword

nonn,base

Author

Lekraj Beedassy, May 29 2010

Extensions

Extended by Ray Chandler, Jul 05 2010

a(5)-a(23) from Donovan Johnson, Jul 06 2010

Status

approved