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A088270
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Palindromic primes that yield a prime when sandwiched between two 3's. (Prefixing and suffixing a -three' on both sides yields another pal prime).
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3
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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
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| 757 is a member as 37573 is also a prime.
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MATHEMATICA
| s23Q[n_]:=Module[{idn=IntegerDigits[n]}, idn==Reverse[idn]&&PrimeQ[ FromDigits[Join[{3}, idn, {3}]]]]; Select[Prime[Range[10000]], s23Q] (* From Harvey P. Dale, May 07 2011 *)
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CROSSREFS
| Cf. A088269, A088271, A088272.
Sequence in context: A196139 A165784 A176619 * A065927 A016054 A158969
Adjacent sequences: A088267 A088268 A088269 * A088271 A088272 A088273
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KEYWORD
| base,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Sep 28 2003
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EXTENSIONS
| More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Jul 28 2005
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