A088283 Palindromic primes in which a single digit is sandwiched between strings of 7's.

727, 757, 787, 797, 77377, 77477, 77977, 7772777, 7774777, 7778777, 777767777, 77777677777, 7777774777777, 777777727777777, 777777757777777, 77777777677777777, 77777777977777777, 777777777727777777777

Offset: 1

Author

Amarnath Murthy, Sep 29 2003

Keywords

• base
• nonn

Links

• Harvey P. Dale, Table of n, a(n) for n = 1..37

Crossrefs

Cf. A088281, A088282, A088284.

Programs

Mathematica

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 *)

Extensions

More terms from David Wasserman, Aug 03 2005