Re: [math-fun] Mental factoring

Rich:

There's a nice scheme mentioned in my CRC Math Tables handbook c. 1960. The handbook has a table of factorizations to 2000, and gives an extender scheme to get to 20K. The credit goes to Prof. Leonard Caners.

Apparently based on Caners' Aug.-Sep. 1956 American Mathematical Monthly article 'On Tables of Factors and Primes': http://www.jstor.org/pss/2309039