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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
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
Sequence in context: A139656 A061323 A082584 * A068687 A093808 A257527
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 April 25 05:56 EDT 2024. Contains 371964 sequences. (Running on oeis4.)