Math Magic Digits Archive

Digits

Matrices

Chess

Games

Single Digit Formulas
(December 1999)
updated 12/15/02

Adding Digits Pairwise
(February 2000)

updated 8/27/11

Friedman Numbers
(August 2000)

updated 1/30/20

Squaring and Striking
(August 2001)

updated 8/31/01

Squaring and Adding
(August 2003)

updated 8/24/11

Small Digit Approximations
(August 2004)

updated 3/11/19

Single Digit Formulas
(December 1999)
updated 12/15/02

Single Digit Formulas
(December 1999)

Adding Digits Pairwise
(February 2000)

Friedman Numbers
(August 2000)

Squaring and Striking
(August 2001)

Squaring and Adding
(August 2003)

Small Digit Approximations
(August 2004)

N^th Powers With N Digits
(March 2008)
updated 3/12/08

N^th Powers With N Digits
(March 2008)

Power Problems
(June 2008)
updated 7/29/08

Power Problems
(June 2008)

Pandigital Factoring
(April 2009)
updated 4/1/09

Pandigital Factoring
(April 2009)

Self-Reproducing Numbers
(April 2012)
updated 4/28/12

Self-Reproducing Numbers
(April 2012)

Unique Digit Equations
(June 2012)
updated 6/1/12

Unique Digit Equations
(June 2012)

Fractional Friedman Numbers
(July 2013)
updated 7/26/13

Fractional Friedman Numbers
(July 2013)

Approximating π and e
with ln's and √'s
(April 2014)
updated 4/10/14

Approximating π and e
with ln's and √'s
(April 2014)

Sums of Powers Oddities
(October 2017)
updated 10/1/17

Sums of Powers Oddities
(October 2017)

City Substitution Equations
(September 2018)
updated 9/1/18

City Substitution Equations
(September 2018)

Anti-, Shifted-, and Paired
Friedman Numbers
(June 2019)
updated 6/26/19

Anti-, Shifted-, and Paired
Friedman Numbers
(June 2019)

Multiplication Problems
(July 2019)
updated 7/31/19

Multiplication Problems
(July 2019)

Single Digit Formulas(December 1999) updated 12/15/02

Nth Powers With N Digits(March 2008) updated 3/12/08

Power Problems(June 2008) updated 7/29/08

Pandigital Factoring(April 2009) updated 4/1/09

Self-Reproducing Numbers(April 2012) updated 4/28/12

Unique Digit Equations(June 2012) updated 6/1/12

Fractional Friedman Numbers(July 2013) updated 7/26/13

Approximating π and ewith ln's and √'s(April 2014) updated 4/10/14

Sums of Powers Oddities(October 2017) updated 10/1/17

City Substitution Equations(September 2018) updated 9/1/18

Anti-, Shifted-, and PairedFriedman Numbers(June 2019) updated 6/26/19

Multiplication Problems(July 2019) updated 7/31/19

Single Digit Formulas
(December 1999)
updated 12/15/02

N^th Powers With N Digits
(March 2008)
updated 3/12/08

Power Problems
(June 2008)
updated 7/29/08

Pandigital Factoring
(April 2009)
updated 4/1/09

Self-Reproducing Numbers
(April 2012)
updated 4/28/12

Unique Digit Equations
(June 2012)
updated 6/1/12

Fractional Friedman Numbers
(July 2013)
updated 7/26/13

Approximating π and e
with ln's and √'s
(April 2014)
updated 4/10/14

Sums of Powers Oddities
(October 2017)
updated 10/1/17

City Substitution Equations
(September 2018)
updated 9/1/18

Anti-, Shifted-, and Paired
Friedman Numbers
(June 2019)
updated 6/26/19

Multiplication Problems
(July 2019)
updated 7/31/19