Random number generator in HP 30S

[ttw]

The alternating odd-even behavior might indicate a linear congruential generator with 2^16 modulus. If you can look at the output in binary, a clue would be that the lowest order bit alternates; the second lowest bit has a cycle of 4; the third order has a cycle of 8, etc. For a cycle of length 2^16, there are algorithms that can determine the parameters; Google can probably find them.