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A089740
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Primes which are digital complements (A055120) of primes.
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3
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3, 5, 7, 13, 31, 37, 43, 67, 73, 79, 97, 103, 113, 127, 139, 157, 163, 173, 181, 191, 199, 223, 227, 229, 233, 251, 257, 271, 281, 283, 313, 337, 349, 353, 359, 367, 383, 409, 419, 433, 449, 457, 463, 467, 479, 491, 523, 541, 547, 563, 569, 587, 601, 619, 631
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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MAPLE
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L:= map(t -> -t mod 10, convert(n, base, 10));
add(L[i]*10^(i-1), i=1..nops(L))
end proc:
filter:= t -> isprime(t) and isprime(A055120(t)):
select(filter, [seq(i, i=3..1000, 2)]); # Robert Israel, Jun 29 2018
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MATHEMATICA
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b=Delete[Union[ Table[If[PrimeQ[a[[n]]]==True, a[[n]], 0], {n, 1, Dimensions[a][[1]]}]], 1]
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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