N[Sum [Binomial [100, i] (1/2)^100,  {i, 65, 100}]]

Floor [3.5]

Floor [E]

Floor [Pi]

Floor[Pi^2]

N [Pi^2]

Floor [-4.6]

n  =  3277

m =  Floor [Sqrt [n]]

Table [{x,  (x + 57)^2  -  3277},  {x, -2, 2}]

FactorInteger [-252]

FactorInteger [-141]

FactorInteger [-28]

FactorInteger [87]

FactorInteger [204]

55 * 57

n  =  3277

a  =  3135

b  =  84

Mod [a^2,  n]

Mod [b^2, n]

GCD [a  +   b, n]

n / 29

n  =  24961

m =  Floor [Sqrt [n]]

Table[{x, (x + m)^2  -  n},  {x, -6, 6}]

MatrixForm [%]

MatrixForm [
      Table[{x, FactorInteger [(x + m)^2  -  n]},  {x, -6, 
          6}]]

a  =  155 *157* 158

b  =  2^3 * 3^2 * 13

n

Mod [a^2,  n]

Mod [b^2, n]

Mod [a, n]

Mod [b, n]