def list_generator(start: int, step: int, number: int) -> list:
    """
    Generates a list with 'number' of integers.
    The first one equals to 'start' and every consequtive is increased by 'step'.
    """
    i = start
    retval = [i]
    for n in range(number):
        i += step
        retval.append(i)
    return retval