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A084445
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Primes that cannot be written as 1+p+p^k, p prime and k>0.
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2
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2, 3, 17, 29, 37, 41, 43, 53, 61, 71, 73, 79, 89, 97, 101, 103, 109, 113, 127, 137, 139, 149, 151, 157, 163, 173, 181, 191, 193, 197, 199, 211, 223, 229, 233, 239, 241, 251, 257, 269, 271, 277, 281, 283, 293, 311, 313, 317, 331, 337, 349, 353, 367, 373, 379
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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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N:= 1000: # for terms <= N
S:= select(isprime, {2, seq(i, i=3..N, 2)}):
for i from 1 do
p:= ithprime(i);
if 2*p+1 > N then break fi;
for k from 1 do
q:= 1+p+p^k;
if q > N then break fi;
S:= S minus {q};
od;
od:
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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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