Задача на python

task = lambda x: ''.join(map(str, range(1, x+1)))

task(4)

def task(x):
    return ''.join....

def xN(N:int):return 'λ'*N 

task2 = lambda x: ''.join(str(i+1)[0]for i in range(x))



t3 = lambda x: x and f'{x%10}{t3(x-1)}'

t2 = lambda x: t2(x-1)+str(x)[0] if x else ''

t4 = lambda x: t4(x-1)+'%c'%(x+48) if x else ''


t5 = lambda x: t5(x-1)+f'{x+48:c}' if x else ''

def t6(x):return t6(x-1)+f'{x+48:c}' if x else ''

def t7(x):return f'{x and t7(x-1)or""}{x+48:c}'

import random
''.join(random.choices("0123456789", k=4))