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A089761
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Smallest k such that k*i^2 + 1 is prime for i = 1 to n.
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0
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1, 1, 4, 22, 58, 58, 58, 54972, 68112, 4748632, 861066640, 861066640, 861066640, 861066640, 861066640
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OFFSET
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1,3
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COMMENTS
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LINKS
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MAPLE
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for n from 1 to 10 do for k from 1 do f:=0: for i from 1 to n do if not isprime(k*i^2+1) then f:=1: break fi od: if f=0 then printf("%d, ", k): break fi od od: # C. Ronaldo
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CROSSREFS
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KEYWORD
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hard,more,nonn
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AUTHOR
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EXTENSIONS
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Corrected and extended by C. Ronaldo (aga_new_ac(AT)hotmail.com), Dec 26 2004
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STATUS
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approved
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