Problem #28

Problem link
Solution:

package main

func main() {
    sum, number, skip := 1, 1, 0
    for i := 0; i < 2000; i++ {
        if i%4 == 0 {
            skip += 2
        }
        for j := 0; j < skip; j++ {
            number++
        }
        sum += number
    }
    println(sum)
}

Result: 669171001
Time: 0m0.005s