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Search: id:A058911
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| A058911 |
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Numbers n such that n^n + n + 1 is prime. |
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+0
3
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OFFSET
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1,2
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COMMENT
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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
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a(2)=2 because 2^2+(2+1)=7
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MATHEMATICA
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Do[ If[ PrimeQ[ n^n + n + 1], Print[n]], {n, 1, 700} ]
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PROGRAM
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(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
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Cf. (n^n+1-1) A058912.
Adjacent sequences: A058908 A058909 A058910 this_sequence A058912 A058913 A058914
Sequence in context: A002076 A071714 A077753 this_sequence A056060 A056058 A028255
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KEYWORD
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nonn,hard,more
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AUTHOR
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Felice Russo (felice.russo(AT)katamail.com), Jan 10 2001
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