Pronic Number
A Figurate Number of the form 
, where 
is the 
th Triangular Number. The first feware 2, 6, 12, 20, 30, 42, 56, 72, 90, 110, ... (Sloane's A002378). The Generating Function of the pronic numbers is
The first few for which 
areA028336), and the first fewA028337).
References
De Geest, P. ``Palindromic Products of Two Consecutive Integers.'' http://www.ping.be/~ping6758/consec.htm. Sloane, N. J. A.A028336,A028337, andA002378/M1581in ``An On-Line Version of the Encyclopedia of Integer Sequences.''http://www.research.att.com/~njas/sequences/eisonline.html.
- Fresnel Integrals
- Fresnel's Elasticity Surface
- Fresnel's Wave Surface
- Frey Curve
- Frey Elliptic Curve
- Friday the Thirteenth
- Friend
- Friendly Giant Group
- Friendly Pair
- Frieze Pattern
- Frobenius-König Theorem
- Frobenius Map
- Frobenius Method
- Frobenius-Peron Equation
- Frobenius Pseudoprime
- Frobenius Theorem
- Frobenius Triangle Identities
- Frontier
- Frullani's Integral
- Frustum
- Fréchet Bounds
- Fréchet Derivative
- Fréchet Space
- Fubini Principle
- Fuchsian System