2017-06-12から1日間の記事一覧
問題 Problem 27:Quadratic primes Euler discovered the remarkable quadratic formula: n^2+n+41 It turns out that the formula will produce 40 primes for the consecutive integer values 0≤n≤39. However, when n=40, 40^2+40+41=40(40+1)+41 is div…