#Eysteinn Lester Batson
import math
import random
def slettar_tolur_1001():
    slettar_listi = []
    for t in range(2, 1002, 2):
        slettar_listi.append(t)
    return slettar_listi


def skrifa_i_skra(listi, nafntxt):
    try:
        with open(nafntxt, "w", encoding="utf-8") as f:
            for tala in listi:
                f.write(str(tala) + " ")
    finally:
        f.close()

def skilaiLista(listi, nafntxt):
    try:
        with open(nafntxt, "r", encoding="utf-8") as f:
            listi = f.readlines()

    finally:
        f.close()

def prenta(listi):
    print(listi)

def medaltal_lista(listi):
    medaltal = sum(listi) // len(listi)
    return round(medaltal, 2)

def tolur_atta(listi, nyrlisti):
    for i in listi:
        if i % 8 == 0:
            nyrlisti.append(i)
    return nyrlisti

def tolur_bil_10(listi):
    for i in range(len(listi)):
        if i % 10 == 9:
            print(listi[i])
        else:
            print(listi[i], end=" ")

def frumtolutekk(tala):
    for p in range(2, tala):
        if tala % p == 0:
            return False
    return True

def frumtolulisti():
    primtolulisti = []
    for i in range(2, 100):
        if frumtolutekk(i):
            primtolulisti.append(i)
    return primtolulisti