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Safe Tan Function

Three Indeterminate Quantities

Three equations with no discernable value.

Aspects of Dirichlet's Theorem

Four aspects of Dirichlet's Theorem that any valid arithmetic progession contains an infinite number of primes.

Congruence Explorer

Enter two integers (the first doesn't have to be smaller than the second!) and discover which integers also have this property.

Catalan Theorem

a^b-c^d <> +/-1 except for 3^2-2^3 with all a,b,c,d>0. Proved in 2002.

Oil Production in $

Calculates the production of oil for a country times the price of oil in $.