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Chris Caldwell's [[Prime Pages]] has a version adapted to [[prime number]] research<ref>{{cite web |url=http://primes.utm.edu/notes/crackpot.html |title= ''The PrimeNumbers' Crackpot index'' |accessdate= October 23, 2007 |author=Chris Caldwell}}</ref> which is a field with many famous unsolved problems that are easy to understand for amateur mathematicians.
An earlier crackpot index is Fred J. Gruenberger's "A Measure for Crackpots"<ref>{{cite web |url=http://www.rand.org/content/dam/rand/pubs/papers/2006/P2678.pdf|format=PDF|title=A Measure for Crackpots|author=Fred J. Gruenberger}}</ref> published in December 1962 by the [[RAND Corporation]].
==See also==
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