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A340731
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Numbers k such that A067439(k) is prime.
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3
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10, 15, 25, 27, 29, 31, 33, 36, 37, 44, 54, 64, 69, 78, 81, 82, 88, 102, 106, 110, 121, 142, 148, 177, 183, 192, 211, 212, 240, 270, 272, 274, 280, 314, 332, 337, 338, 344, 367, 381, 384, 404, 412, 421, 429, 434, 460, 463, 467, 490, 502, 511, 519, 523, 530, 551, 559, 584, 586, 588, 614, 624, 628
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OFFSET
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1,1
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LINKS
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EXAMPLE
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a(3) = 25 is a term because A067439(25) = 83 is prime.
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MAPLE
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filter:= proc(n) local t, k;
isprime(add(`if`(igcd(n, k)=1, n mod k, 0), k=2..n-1))
end proc:
select(filter, [$1..1000]);
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PROG
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(PARI) isok(n) = isprime(sum(i=1, n-1, if(gcd(n, i)==1, n%i))); \\ Michel Marcus, Jan 18 2021
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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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