func C036() (interface{}, error) {
sum := 0
for nb := 1; nb < 1000000; nb++ {
if nb%2 == 0 {
continue
}
nbStr := strconv.Itoa(nb)
if nbStr != utils.ReverseString(nbStr) {
continue
}
binary := strconv.FormatInt(int64(nb), 2)
if binary != utils.ReverseString(binary) {
continue
}
sum += nb
}
return sum, nil
}
func C026() (interface{}, error) {
longestSize := 1
var longestNumber int64
for i := int64(2); i < 1000; i++ {
rat := big.NewRat(1, i)
floatString := rat.FloatString(2000)
cycleSize := utils.LongestRecurringCycleInString(utils.ReverseString(floatString[10:]), 1)
// fmt.Println(i, floatString, cycleSize)
if cycleSize > longestSize {
// fmt.Println(i, cycleSize, floatString)
longestSize = cycleSize
longestNumber = i
}
}
return longestNumber, nil
}
func C004() (interface{}, error) {
biggest := 0
for a := 999; a >= 100; a-- {
for b := 999; b >= 100; b-- {
product := a * b
if product < biggest {
continue
}
productStr := strconv.Itoa(product)
if productStr == utils.ReverseString(productStr) {
if biggest < product {
biggest = product
}
}
}
}
return biggest, nil
}