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A058912
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Numbers k such that k^k + k - 1 is prime.
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6
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OFFSET
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1,1
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COMMENTS
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Except for the first term all terms are of the form 3k or 3k+1. - Farideh Firoozbakht, Oct 18 2006
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LINKS
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EXAMPLE
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3 is a term because 3^3 + 3 - 1 = 29.
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MATHEMATICA
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Do[ If[ PrimeQ[ n^n + n - 1], Print[n]], {n, 1, 750} ]
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PROG
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CROSSREFS
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KEYWORD
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nonn,more,hard
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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