pai 9 numere au o cifra
9x1=9
89 nr. cu 2 cifre
89x2=178
462 nr. cu 3 cifre
462x2=1386
1386+9+178=1573 cifre
nr. cu cifra 4:4,14,24,34,de la 40 la 49,54,64,74,84,94,104,114,124,134,de la 140 la 149,154,164,174,184,194,204,214,224,234,de la 240 la 249,254,264,274,284,294,304,314,324,334,de la 340 la 349,354,364,374,384,394,de la 400 la 499,504,514,524,534,de la 540 la 549,554.
Cifra 4 apare de :194 de ori
