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Pronic (Oblong) Numbers

Generate pronic numbers, look up a term, or test whether a number is the product of two consecutive integers.

A pronic number, also called an oblong number, is the product of two consecutive integers: P(n) = n(n+1). Indexing here is 0-based, so P(0) = 0 is the first term.

They begin 0, 2, 6, 12, 20, 30, 42, 56, 72, 90. Every pronic number is even and twice a triangular number.

Generate first K terms

Up to 1000 terms.

Look up P(n)

Test a number