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RE: Brainsteem Mathematics Challenges: Divisibility by 65
f(1)=18+9k=9 * (2+k)
f(1)=9 * 65 * x
18+9k=585x
let x=1 => 18+9k=585
k=63
f(n)=5n13 + 13n5 + 567n
f(1)=18+9k=9 * (2+k)
f(1)=9 * 65 * x
18+9k=585x
let x=1 => 18+9k=585
k=63
f(n)=5n13 + 13n5 + 567n