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A118958
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Primes that cannot be written as 2^k + p with p prime < 2^k.
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5
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2, 3, 5, 17, 31, 41, 47, 53, 59, 73, 79, 89, 97, 103, 109, 113, 127, 137, 149, 163, 167, 173, 179, 191, 193, 197, 223, 227, 233, 239, 251, 257, 271, 277, 281, 283, 307, 311, 313, 331, 337, 347, 349, 367, 373, 379, 389, 397, 401, 409, 421, 431, 433, 439, 443
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OFFSET
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1,1
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COMMENTS
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LINKS
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MAPLE
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filter:= proc(n) not isprime(n-2^ilog2(n)) end proc:
select(filter, [seq(ithprime(i), i=1..100)]); # Robert Israel, Jan 27 2021
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MATHEMATICA
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okQ[n_] := !PrimeQ[n-2^(Length[IntegerDigits[n, 2]]-1)];
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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