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A088283
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Palindromic primes in which a single digit is sandwiched between strings of 7's.
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4
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727, 757, 787, 797, 77377, 77477, 77977, 7772777, 7774777, 7778777, 777767777, 77777677777, 7777774777777, 777777727777777, 777777757777777, 77777777677777777, 77777777977777777, 777777777727777777777
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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Harvey P. Dale, Table of n, a(n) for n = 1..37
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MATHEMATICA
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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 *)
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CROSSREFS
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Cf. A088281, A088282, A088284.
Sequence in context: A090268 A090267 A068688 * A123096 A108846 A052234
Adjacent sequences: A088280 A088281 A088282 * A088284 A088285 A088286
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KEYWORD
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base,nonn
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AUTHOR
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Amarnath Murthy, Sep 29 2003
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EXTENSIONS
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More terms from David Wasserman, Aug 03 2005
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STATUS
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approved
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