Chris, please check test 21. The factors of 1535238 include two 67's, therefore it seems to me the solution should be 134.
David: Take another look. ChrisR's anti-lookup trick lets correct solutions pass the test!
David, you are correct for Kempner(1535238), but that test asks for Kempner(Kempner(Kempner(1535238))).
Right Triangle Side Lengths (Inspired by Project Euler Problem 39)
Find the gcm of n given values
Expand 10^n to Powers of 4
List modest numbers up to n
Create a sequence of primes p such that p > n π(p)
Pass the cards in Fitch Cheney's five-card trick
Compute expulsions from the Kimberling shuffle
List the dihedral primes
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