Decades: 290s BC 280s BC 270s BC 260s BC 250s BC - 240s BC - 230s BC 220s BC 210s BC 200s BC 190s BC
Years: 248 BC 247 BC 246 BC 245 BC 244 BC - 243 BC - 242 BC 241 BC 240 BC 239 BC 238 BC
... is periodic with period k.
χ(n) = 0 for every n with gcd(n,k) > 1
χ(mn) = χ(m)χ(n) for all positive integers m and n
χ(1) = 1
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