Recursive function to convert an integer to a column name in A1 notation. I used this to convert array indexes to column names in Google's Spreadsheets.

indexToA1Notation.go

func indexToA1Notation(column int) string {
	if column <= 'Z'-'A' {
		return string(rune('A' + column))
	}
	return fmt.Sprintf("%s%s", indexToA1Notation((column/26)-1), string(rune('A'+column%26)))
}