Pachisi

Pacioli Ducats

Packing

Pagination

Pajarita

Palindrome Number

Pandects

Pandiagonal Latin Square

Pandiagonal Square

Pandigital Identity

Pandigital Number

Panmagic Square

Pantograph

Pantriagonal Magic Cube

Paper

Paper and Pencil

Paper Folding

Paradox

Paradromic Ring

Parity

Parquet

Partition of a Chain

Partition of a Number 

Parlour Game

Paroli

Pascal's Triangle

Pass-Seven

Path

Pathological Curve

Patience (1)

Patience (2)

Pattern (1)

Pattern (2)

Pawn

Peano Curve

Peasant Multiplication

Peeling

Peg

Pennant

Penrose Stairway

Penrose Tiles

Penrose Triangle

Pentabolo

Pentacle

Pentacube

Pentafoil

Pentagon

Pentagonal Centered Number

Pentagonal Chessboard  

Pentagonal Gnomonic Number 

Pentagonal Hyperpyramidal Number

Pentagonal Knot

Pentagonal Number

Pentagonal Pyramidal Number

Pentagrade

Pentagram

Pentahex

Pentahexaflexagon

Pentalpha

Pentamagic Square

Pentaperfect Number

Pentiamond

Pentomino

Pentominoes

Pentosceles

Perfect Cube

Perfect Information

Perfect Magic Cube

Perfect Number

Perfect Rectangle

Perfect Square

Perfectible Robot

Perfectly Odd Square

Perigal Quadrilateral

Perimeter-Magic Polygon

Period Length

Permutation

Perpetual Calendar

Persan Caliph

Persistence

Personal Move

Pettie

Philosophers' Dinner

Pick's Formula

Piece

Pierrot

Piling

Pillar

Pin

Piquemouche

Plait

Plaited Polyhedron

Plaiting

Planar Graph

Plane Country

Plane Number

Plane Piece

Plane Polycube

Planetary Table

Plank

Platonic Solid

Platonic Equation

Player

Plinthid

Point

Point of Equilibrium

Points

Points Junction

Points and Squares

Poker

Polyabolo

Polycube

Polyform

Polyfrob

Polygon

Polygonal Knot

Polygonal Lattice

Polygonal Number

Polygram

Polyhedral Number

Polyhedron

Polyhex 

Polyiamond

Polynomial Sequence

Polyoid

Polyomino

Polyosceles

Polyplet

Ponzo's Illusion

Position

Postage Stamp Folding

Practical Number

Predecessor

Pretzel

Prime Magic Cube

Prime Magic Square

Prime Knot

Prime Number

Prime Power

Primitive Knot

Probability

Progression

Promecic Number

Promotion

Pronic Number

Proper Divisor

Protagoras Paradox

Power

Powerful Number

Primitive Semiperfect Number

Purely-Even Number

Pursuit

Puzzle

Pyramid

Pyramidal Number

Pythagoras Star

Pythagoras Table

Pythagoras Triangle

Pythagorean Numbers

Pythagorean Quadruple

Pythagorean Quintuple

Pythagorean Triad

Pythagorean Triple