A088270 Palindromic primes that yield a prime when sandwiched between two 3's. (Prefixing and suffixing a -three' on both sides yields another pal prime).

5, 7, 101, 151, 353, 727, 757, 929, 10301, 10601, 12721, 15551, 16061, 16661, 18181, 19391, 19891, 30403, 30703, 31013, 31513, 35353, 36263, 36563, 38083, 39293, 72227, 73237, 76367, 77377, 77477, 78487, 79397, 79997, 93139, 94649, 94849

Offset

1,1

Links

Table of n, a(n) for n=1..37.

Example

757 is a member as 37573 is also a prime.

Mathematica

s23Q[n_]:=Module[{idn=IntegerDigits[n]}, idn==Reverse[idn]&&PrimeQ[ FromDigits[Join[{3}, idn, {3}]]]]; Select[Prime[Range[10000]], s23Q] (* Harvey P. Dale, May 07 2011 *)

Crossrefs

Cf. A088269, A088271, A088272.

Sequence in context: A176619 A230379 A292847 * A259496 A338525 A267586

Adjacent sequences: A088267 A088268 A088269 * A088271 A088272 A088273

Keyword

base,nonn

Author

Amarnath Murthy, Sep 28 2003

Extensions

More terms from David Wasserman, Jul 28 2005

Status

approved