Question

can formula P(n)=n^2-81n+1681be used for generating only prime numbers P with all positive integers n? Why?

Answer 1

no, as if u put n=41, the whole expression will be divisible by 41 and will not be a prime number

Answer 2

no, in this case, if u put n=41, the result will come out 41. so, put any multiple of 41 other than 41 :)

Answer 3

@Arnab09 how you find 41?

Answer 4

1681 is 41^2 you can also use 9 in this case

Answer 5

1681 is 41^2
so, if n is a multiple of 41, the whole expression becomes a multiple of 41

Answer 6

how 9? @mathmagician ?

Answer 7

sorry, 81

Answer 8

yep..