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tmua.fyi Paper 2 Challenge 2 · Q1

Paper 2Logic & proofNumber & counting

Which of the following is a counterexample to the claim that n2+n+41n^2+n+41 is prime for every positive integer nn?

An=1n=1
Bn=10n=10
Cn=20n=20
Dn=30n=30
En=40n=40
Fn=39n=39
Gn=50n=50
Hthere is none

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