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A088283 Palindromic primes in which a single digit is sandwiched between strings of 7's. 4
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)
OFFSET

1,1

LINKS

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

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 *)

CROSSREFS

Cf. A088281, A088282, A088284.

Sequence in context: A090268 A090267 A068688 * A123096 A108846 A052234

Adjacent sequences:  A088280 A088281 A088282 * A088284 A088285 A088286

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Sep 29 2003

EXTENSIONS

More terms from David Wasserman, Aug 03 2005

STATUS

approved

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Last modified May 18 14:41 EDT 2022. Contains 353816 sequences. (Running on oeis4.)