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3 results for “congruence”

Formulae (3)

h = \left(q + \left\lfloor\tfrac{13(m+1)}{5}\right\rfloor + K + \left\lfloor\tfrac{K}{4}\right\rfloor + \left\lfloor\tfrac{J}{4}\right\rfloor + 5J\right) \bmod 7

Finds the day of the week for any Gregorian date.

a \equiv b \pmod{m}

a and b have the same remainder when divided by m.

(p-1)! \equiv -1 \pmod{p}

A primality criterion for p.