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A058911
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Numbers n such that n^n + n + 1 is prime.
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3
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OFFSET
| 1,2
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COMMENTS
| 0^0 is undefined, so 0 is not a member.
There is no further term up to 10000. - Farideh Firoozbakht (mymontain(AT)yahoo.com), Nov 11 2006
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EXAMPLE
| a(2)=2 because 2^2+(2+1)=7
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MATHEMATICA
| Do[ If[ PrimeQ[ n^n + n + 1], Print[n]], {n, 1, 700} ]
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PROG
| (PARI) f2(n, k) = for(x=1, n, y=x^x+x+k; if(ispseudoprime(y), print1(x", "))) - Cino Hilliard (hillcino368(AT)gmail.com), Jan 07 2005
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CROSSREFS
| Cf. (n^n+1-1) A058912.
Sequence in context: A145761 A071714 A077753 * A191542 A191668 A056060
Adjacent sequences: A058908 A058909 A058910 * A058912 A058913 A058914
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KEYWORD
| nonn,hard,more
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AUTHOR
| Felice Russo (frusso(AT)micron.com), Jan 10 2001
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