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A032624
Numbers k such that k concatenated with k+9 is a prime.
4
2, 10, 14, 20, 28, 38, 40, 50, 52, 58, 62, 64, 70, 80, 82, 100, 104, 110, 112, 118, 122, 124, 142, 148, 160, 164, 170, 172, 178, 188, 194, 208, 218, 224, 230, 238, 244, 248, 250, 260, 262, 274, 284, 292, 298, 308, 320, 338, 344, 352, 362, 364, 382, 398, 400
OFFSET
1,1
LINKS
MAPLE
tcat:= (a, b) -> a*10^(1+ilog10(b))+b:
select(t -> isprime(tcat(t, t+9)), [seq(i, i=2..1000, 2)]); # Robert Israel, Sep 04 2024
MATHEMATICA
Select[Range[400], PrimeQ[FromDigits[Join[IntegerDigits[#], IntegerDigits[#+9]]]]&] (* Stefano Spezia, Sep 04 2023 *)
CROSSREFS
Cf. A032614.
Sequence in context: A349832 A050546 A032384 * A350059 A349833 A091999
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, May 15 1998
STATUS
approved