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A088282 Palindromic primes in which a single digit is sandwiched between strings of 3's. 4
313, 353, 373, 383, 33533, 3331333, 3337333, 333333313333333, 333333373333333, 333333383333333, 33333333333733333333333, 333333333333373333333333333, 33333333333333333533333333333333333, 33333333333333333733333333333333333 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(36) has 1553 digits and is therefore too large to include in the b-file. - Harvey P. Dale, Mar 22 2020

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..35

MATHEMATICA

Select[FromDigits/@Flatten[Table[Join[PadRight[{}, k, 3], {n}, PadRight[ {}, k, 3]], {n, 0, 9}, {k, 20}], 1], PrimeQ]//Sort (* Harvey P. Dale, Mar 22 2020 *)

CROSSREFS

Cf. A088281, A088283, A088284.

Sequence in context: A139656 A061323 A082584 * A068687 A093808 A257527

Adjacent sequences:  A088279 A088280 A088281 * A088283 A088284 A088285

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 17 19:51 EDT 2022. Contains 353778 sequences. (Running on oeis4.)