A088283 - OEIS

%I #7 Jun 15 2015 11:18:25

%S 727,757,787,797,77377,77477,77977,7772777,7774777,7778777,777767777,

%T 77777677777,7777774777777,777777727777777,777777757777777,

%U 77777777677777777,77777777977777777,777777777727777777777

%N Palindromic primes in which a single digit is sandwiched between strings of 7's.

%H Harvey P. Dale, <a href="/A088283/b088283.txt">Table of n, a(n) for n = 1..37</a>

%t Select[Flatten[Table[FromDigits[Flatten[Join[{PadRight[{},n,7], i, PadRight[ {},n,7]}]]],{n,10},{i,0,9}]],PrimeQ] (* _Harvey P. Dale_, Jun 15 2015 *)

%Y Cf. A088281, A088282, A088284.

%K base,nonn

%O 1,1

%A _Amarnath Murthy_, Sep 29 2003

%E More terms from _David Wasserman_, Aug 03 2005