**Richard Schroeppel, Biographical sketch.**

* Richard
Schroeppel (Illinois 1948 - )(photo by Thane Plambeck, 2004)*

I am a computing mathematician, Utah, USA. BS math MIT '68. Working with Magic Squares for forty years.

I'm 55 years old, born in 1948 in Illinois, near Chicago. I worked at the University of Arizona Computer Sciences department from 1991-1998 as a security researcher. They've generously continued my computer account and web page at http://www.cs.arizona.edu/~rcs. I currently work for Sandia National Labs.

Ancient achievements include factoring Mersennes M137 & M149, counting
magic squares of size 5, showing tictactoe 7^{3} and 11^{4}
are draws, first time-analysis of the continued fraction factoring method, invention
of the "linear sieve" for factoring, early computer programs for finding
multiperfect numbers, discovery of the cuphook oscillator in Life, development
of methods for computing Bessel J0(e+pi) to a jillion places, early work on
numerical transcendence checking.

Modern work includes elliptic curve algorithms & programs, the Hasty
Pudding Cipher, determination of minimal cicruits for boolean functions of 4
variables, showing that 2^{1/5} has a division algorithm, and finding
new loopers for the 00/1101 Post Tag problem.

*Richard SchroeppelDecember 5th, 2003*

Return to the home page http://www.multimagie.com