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A181732
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Numbers n such that 90n + 1 is prime.
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26
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2, 3, 6, 7, 9, 11, 13, 17, 18, 20, 24, 25, 26, 28, 31, 33, 34, 37, 39, 41, 45, 47, 51, 54, 55, 62, 65, 68, 69, 70, 72, 73, 74, 76, 84, 86, 89, 90, 91, 94, 96, 97, 98, 100, 101, 102, 107, 108, 109, 110, 117, 119, 121, 123, 124, 125, 130, 133, 136, 138, 139, 140
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OFFSET
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1,1
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LINKS
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FORMULA
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MAPLE
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a:= proc(n) option remember; local k;
for k from 1+ `if`(n=1, 1, a(n-1))
while not isprime(90*k+1) do od; k
end:
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MATHEMATICA
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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