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A032631 Primes that are concatenations of n with n + 8. 1
19, 311, 1321, 1523, 2129, 3947, 4957, 5563, 6977, 7583, 9199, 111119, 115123, 159167, 163171, 165173, 169177, 171179, 183191, 193201, 195203, 199207, 201209, 205213, 211219, 229237, 235243, 241249, 249257, 265273 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
MATHEMATICA
Select[Table[FromDigits[Flatten[IntegerDigits/@{n, n+8}]], {n, 1, 301, 2}], PrimeQ](* Harvey P. Dale, Sep 07 2019 *)
CROSSREFS
Sequence in context: A267010 A182460 A370318 * A142430 A180845 A138943
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, May 15 1998
EXTENSIONS
Edited by Charles R Greathouse IV, Apr 28 2010
STATUS
approved

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Last modified March 28 15:28 EDT 2024. Contains 371254 sequences. (Running on oeis4.)