Composition of n objects on p heaps

Competition with n players and t courts

Recurrences Iterates a second degree recurrence relation

Continued fractions expansion

The ant shortest path on a box

Cards trick Calculate cards rank in a card trick

Apollonius circles Calculate radius of circles touching 3 others

Descartes formula Calculate the radii of 4 mutually tangent circles

Pythagora Pythagorean triples (right triangles with integer sides)

Pythagora Pythagorean triples with a given side

60° triangles Integer sides of triangles with 60° or 120° angle

Sum of squares Decomposition as sum of 2 squares

Sum of squares Decomposition as sum of 3 and 4 quares

Sum of triangles Decomposition as sum of triangular numbers

Sum of divisors Sum of divisors

Inverse totient Inverse of Euler totient, solve φ(x)=a

Aegyptian fractions Decomposition of p/q (and camels problem)

Equation ax+by=c 1st degree Diophantine equation

Equation ax+by+cz=d 1st degree Diophantine equation in 3 unknowns

Equation ax+by+cz=d linear Diophantine system of n equations in m unknowns

Ternary conversions Conversions base 10 ↔ base 3 ↔ ternary

Weighting plan Weighting plan for the fake coins bags. Sequence with a[i] ± a[j] all unequal

Explorer Number of camels to cross over the desert

PQa algorithm Solve Pell equation x² - Dy² = ±1, continued fraction of quadratic irrational

3rd degree equation Solve ax³ + bx² + cx + d = 0 (Newton)

4th degree equation Solve ax^{4} + bx^{3} + cx^{2} + dx + e = 0 (Newton, manual start)

ROT13 coding Encode and decode ROT13

Scrabble code Encode with Scrabble code (letter → value)

mpf code Encode and decode mpf (kennify/dekennify)

Morse Code Encode into Morse

quadrilateral Area of a quadrilateral - solve for given area

JavaSketchpad compiler Compiler for geometric constructions